The Royal Bank of Scotland.
Reading the half year results from RBS makes intereting reading:-
Total assets of £782,654 Million (£782 Billion)
which is made up of:-
Cash and balances at central banks £86,807m
Net loans and advances to banks £20,685m
Net loans and advances to customers £326,059m
Reverse repurchase agreements and stock borrowing £40,030m
Debt securities and equity shares £86,687m
Derivatives £193,531m
Other assets £28,855m
Total £782,654 Million
That is about 50% of the annual GDP of the UK economy