Building Societies Association
The Building Societies Association (BSA) was originally established in 1869. It is the voice for all 42 building societies as well as seven large credit unions in the United Kingdom. Together these organisations serve around 25 million customers. The BSA's objective is to push for the best outcomes for building societies and other members from the plethora of new and changing regulation and legislation in the UK and Europe. Key sector statistics 
Building societies have total assets of £415 billion and, together with their subsidiaries, hold residential mortgages of almost £330 billion, 23% of the total outstanding in the UK. They hold over £280 billion of retail deposits, accounting for 19% of all such deposits in the UK and account for 37% of all cash ISA balances. Building societies employ approximately 42,500 full and part-time staff and operate through approximately 1,470 branches. References

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Building societies of the United Kingdom
Banks established in 1869
Mortgage industry associations
Trade associations based in the United Kingdom
Organisations based in the City of Westminster