British Patient Capital (a BBB subsidiary) and the wider British Business Bank don’t write cheques to founders. They commit to and co-invest alongside UK venture and growth-equity managers — Balderton, Northzone, Octopus, Plural and others in the atlas above — who then back companies on their normal terms. The BPC stamp is what makes those funds bigger and more patient than they would otherwise be.
The Mansion House Accord (2023) and Mansion House Compact (2024–25) extend the same logic to UK pension capital: DC schemes have publicly committed a share of assets to UK private markets, routed via fund managers (including the British Growth Partnership) rather than directly. Founders don’t apply to Mansion House — they raise from a fund that has Mansion House money inside it.
Practical implication for founders: when a UK VC tells you its LP base includes BBB / BPC / Mansion House signatories, that’s typically a positive signal on fund stability and follow-on capacity — not a separate channel you can apply to.