Longwall's £100m Deeptech Fund Signals Investor Appetite for UK Deep Tech Founders

Longwall, the venture capital firm co-founded by former Revolut investor Alex Depledge and entrepreneur entrepreneur Chris Lattner, has announced a £100 million fund dedicated to deep technology ventures. The move underscores growing investor conviction in UK-based hardware, biotech, energy, and advanced materials startups—categories that require significant capital but have historically struggled to attract early-stage funding in Britain.

The announcement arrives at a pivotal moment for the UK startup ecosystem. While software-as-a-service companies have dominated venture capital deployment over the past decade, deep tech founders report persistent challenges accessing capital at pre-Series A and Series A stages. Longwall's fresh commitment suggests institutional investors now see a viable thesis around deeptech, particularly where UK scientific and engineering talent intersects with European and US markets.

For founders working on physics-based problems, novel materials, or breakthrough biomedical devices, the fund represents a tangible signal: patient capital exists for ventures that require longer time horizons and deeper technical validation before customer revenue.

What Longwall's Fund Covers: Scope and Investment Thesis

Longwall's £100 million vehicle targets founders building in six core verticals:

• Advanced materials and manufacturing: Composites, semiconductors, and processes that reduce production cost or unlock new functionality.
• Climate and energy: Decarbonisation technologies, battery systems, hydrogen production, and grid infrastructure.
• Biotech and healthcare: Therapeutics, diagnostics, and precision medicine ventures with defensible intellectual property.
• Space and aerospace: Satellite communications, launch systems, and orbital services.
• AI and machine learning for physical systems: Optimization of hardware, drug discovery, and autonomous systems.
• Defence and resilience: Sovereign capability and critical infrastructure technologies.

The fund's ticket size—typically £500,000 to £5 million at first cheque—positions it as a lead investor for UK-based pre-seed and seed-stage deeptech startups. This fills a known gap: UK government initiatives like Innovate UK offer grants and vouchers, but venture-style equity capital has been harder to source at the earliest stages of deep tech venture building.

Longwall's team brings operational pedigree. Depledge previously invested in fintech and payments at Fuel Ventures; Lattner, a technologist with degrees in physics and materials science, brings credibility in assessing technical risk. The partnership model suggests a hands-on approach: founders should expect investor involvement in hiring, fundraising strategy, and technical problem-solving.

Why Deep Tech Funding Matters for UK Competitiveness

The UK has world-class research institutions—Cambridge, Oxford, UCL, Imperial—and a history of scientific breakthroughs. Yet the venture capital ecosystem has historically underweighted hardware and physics-based ventures, favoring software and consumer tech. This creates a leakage problem: founders graduate from top universities with breakthrough ideas but migrate to Silicon Valley or the EU in search of capital and ecosystem support.

A 2023 report by the British Private Equity & Venture Capital Association noted that deep tech represented only 18% of UK VC funding despite accounting for roughly 40% of venture-backed exits by value. Longwall's fund aims to rebalance that ratio.

Practical Implications for Founders: How to Access the Capital

Longwall operates a rolling application process, accepting founder submissions through its website. The fund's decision-making timeline is shorter than traditional institutions—typically 4 to 8 weeks from initial pitch to term sheet for promising candidates.

What Longwall Looks for in Founders and Teams

Deep tech investors prioritize technical founder involvement. Longwall's portfolio reviews suggest they favour:

• Technical co-founder parity: At least one co-founder with hands-on expertise in the core technology or science domain. Academic credentials or prior industry experience in the space is a positive signal.
• Clear technical differentiation: Not just an idea, but a working prototype, peer-reviewed validation, or proprietary process. Vague claims of "revolutionary" physics rarely pass diligence.
• Market understanding: Evidence that the founder understands customer needs and the regulatory landscape. For biotech or aerospace, knowing FDA timelines or CAA requirements is essential.
• Realistic capital requirements: A credible breakdown of how capital will reach first technical milestone (proof of concept, regulatory pathway entry, or customer validation). Avoid overconfident "we'll be profitable in 18 months" narratives for deep tech.
• IP strategy: A plan to protect intellectual property—patents filed, trade secrets documented, or exclusive licensing from university IP offices.

Longwall's team will conduct technical due diligence, often involving independent expert reviews from academics or industry specialists. Founders should prepare for questions about competing approaches, technical risk, and regulatory pathways.

Application and Documentation

Founders should prepare a pitch deck that covers:

• The technical problem and why existing solutions fail.
• Your proprietary approach or innovation (with sufficient detail to demonstrate understanding, but protecting trade secrets).
• Preliminary proof of concept or validation data.
• Market size and customer discovery interviews (even if small-scale).
• Current funding raised and use of proceeds.
• Team bios, emphasizing technical track record and domain expertise.

For biotech founders, include preclinical data, regulatory strategy, and manufacturing assumptions. For hardware, include CAD designs, prototype photos, and supply chain risk analysis. For climate tech, quantify the carbon abatement and unit economics.

The Wider UK Deeptech Funding Landscape

Longwall is not alone in this space, but its £100 million fund is one of the largest UK-dedicated deep tech vehicles launched recently. Context matters:

Other Notable UK Deep Tech Investors

Pale Blue Dot: A London-based space tech fund that has backed companies like Orbcomm heritage and emerging UK satellite operators. Early-stage focus.

Backed VC: London-based with £85 million under management, covering deeptech and climate. Known for intensive mentor networks and connections to Fortune 500 strategic investors.

Amadeus Capital Partners: Cambridge-headquartered with deeptech expertise, particularly in semiconductors and biotech. Larger cheques, typically post-seed.

Innovate UK: While not a venture investor, the UK government's Innovate UK programme offers grants (£100,000–£2 million) and co-investment for early-stage deep tech ventures meeting specific innovation criteria. No equity dilution, though repayment is expected if the venture succeeds commercially.

Entrepreneur Entry Level Loan Scheme (now via Metro Bank and others): Up to £25,000 in non-dilutive capital if you have a business plan and are based in a designated region.

Tax Incentives for Deep Tech Founders and Investors

UK deep tech founders should be aware of two critical tax reliefs:

• SEIS (Seed Enterprise Investment Scheme): Allows early-stage investors to claim up to 50% income tax relief on investments up to £100,000 per investor. For founders, it unlocks investor interest because the tax relief lowers investor risk. Eligible if your company has raised less than £150,000 in prior equity funding.
• EIS (Enterprise Investment Scheme): Similar relief (up to 30%) for companies raising up to £1 million in a tax year. More widely used for Series A rounds. Check HMRC's advance assurance process to confirm eligibility before fundraising.

Longwall-backed companies can leverage these reliefs in future funding rounds, significantly improving their fundraising leverage.

Case Studies: UK Deep Tech Success Stories and Market Traction

Benchling (Synthetic Biology Software)

While US-headquartered, Benchling's early seed funding came partly from UK-based angels and institutional investors recognizing the need for computational biology tools. The company went on to raise $240 million and is now a category leader. The lesson: UK capital exists for deep tech founders with credible technical teams and an ambitious market vision.

Oxbotica (Autonomous Vehicle Software)

An Oxford-founded company that raised £17 million to develop autonomous navigation software. The venture succeeded because founders balanced breakthrough research (from the University of Oxford's robotics department) with real-world customer pilots in agriculture and mining. Longwall-style investors value this blend of technical rigor and commercial pragmatism.

LanzaJet (Sustainable Aviation Fuel)

US-based, but the technology was co-developed with Cambridge researchers. Their £400 million Series C demonstrates the market appetite for climate tech. UK founders with similar ambitions in energy or materials can reference comparable exits.

How Longwall Fits into Your Fundraising Timeline

A realistic deep tech fundraising roadmap:

• Pre-seed (£100k–£500k): Angels, SEIS investors, Innovate UK grants, and micro-VCs like Longwall. Timeline: 3–6 months to first cheque.
• Seed (£500k–£2 million): Seed-focused VCs, EIS-eligible investors, and strategic angels from industry. Longwall may participate or lead. Timeline: 6–9 months.
• Series A (£3 million–£10 million+): Growth-stage VCs, corporate venture arms (e.g., Shell Ventures for climate tech, GSK for biotech), and international investors. Longwall may follow-on. Timeline: 6–12 months.

Founders should engage Longwall early—ideally at the idea or pre-prototype stage—to validate the technical thesis and signal product-market fit to downstream investors.

Getting Investor-Ready: Operational Checklist for Longwall Applications

Before submitting to Longwall or any deep tech fund:

• Incorporate a UK company: File incorporation with Companies House if you haven't already. Advisable even for pre-revenue ventures, as it signals professionalism and enables SEIS/EIS eligibility.
• Clarify IP ownership: Ensure all patents, trademarks, and trade secrets are assigned to the company (not individual founders). If you licensed university IP, document the terms and any exclusivity provisions.
• Build a technical advisory board: Recruit 2–3 respected figures from academia or industry in your domain. They add credibility and provide technical validation during fundraising.
• Document customer validation: Even five customer discovery interviews (not sales calls) provide evidence of market demand. Investors want to see founder commitment to understanding users.
• Prepare financial assumptions: A simple P&L projection for three years, including assumptions about customer acquisition cost, lifetime value, and manufacturing economics. Realism beats optimism.
• Know your regulatory pathway: For biotech, explain FDA or EMA timelines and costs. For aerospace, reference CAA or EASA certification. For hardware, address CE marking or relevant standards. Vague answers will stall diligence.

Momentum and the Broader Ecosystem Effect

Longwall's announcement signals confidence in UK deep tech beyond just the £100 million deployed. When a credible fund anchors capital in a category, it typically triggers a cascade:

• Follow-on funds and LPs gain confidence and deploy capital into parallel deep tech vehicles.
• University technology transfer offices step up commercialization efforts, knowing more venture capital is available to fund spinouts.
• Talent (researchers, engineers) who might have relocated to the US now consider staying in the UK.
• Corporate venture arms (BP, Unilever, etc.) increase strategic investment in deep tech if emerging UK startups show traction.

For founders building in climate, biotech, or advanced manufacturing, the timing is opportune. Government backing through Innovate UK, institutional interest (Longwall, Pale Blue Dot, Backed VC), and corporate strategic interest converge to unlock capital.

Key Takeaways for Founders

• Longwall's £100 million fund addresses a real gap in UK early-stage deep tech capital. If your venture involves hardware, biotech, climate, or defence tech, the fund is worth approaching.
• Prepare rigorously. Deep tech investors expect technical depth. Have a prototype, preliminary data, or regulatory pathway mapped out. Vague pitches will not succeed.
• Leverage tax incentives. SEIS and EIS reliefs make UK deep tech investing attractive for angels and seed investors. Ensure your company qualifies and communicate this advantage.
• Combine grants and equity. Innovate UK grants can fund early proof-of-concept work, de-risking equity rounds. Many successful deep tech founders layer both capital sources.
• Build a technical team. Co-founders with domain expertise, and an advisory board of respected figures, dramatically improve fundraising outcomes for deep tech.
• Think global, but anchor locally. Longwall and UK-based VCs can fund ventures targeting global markets. Use UK presence as a base, not a ceiling.

The UK's deep tech ecosystem is maturing. Longwall's arrival is a vote of confidence—one that founders with serious technical ambitions should capitalize on now.