Mutual Collaboration: Building Societies and Credit Unions

Why this paper

Building societies and credit unions are adjacent mutual sectors solving many of the same problems separately. This paper examines where collaboration is practical today - and where it needs policy change.

Inside the full paper:

• The numbers: 42 UK building societies (~£677bn assets) alongside a £4.9bn, 2.17m-member credit union sector - and what the asymmetry makes possible
• Payroll savings as the first shared rail: the autosave evidence, the National Coalition of Employers, and why workplace distribution favours collaboration over competition
• The August 2026 CUSO framework - the immediate, PRA-accommodated route to shared mutual infrastructure
• The structural gap: why no straightforward statutory route exists for credit-union-to-building-society transfers of engagements, and whether there is a policy case for one
• A practical operating model for shared plumbing that lets mutuals compete on proposition, service and trust

Mark McAlpine is the founder of N2 Financial Systems, the platform behind modern mutual and community banking.