It is not as simple as that.
If the banks were to fail and the government declared bankrupt, the biggest financial losers would be (in order of greatest monetary loss to lowest)
A) Sovereign bondholders - German and other banks, hedge funds. All who will get £1.4B when the bonds mature in June, if the government doesn't default
B) Bank Shareholders -largest holdings by wealthy individuls and institutional investors
C) Depositors with funds greater than ?100,000 - Russians, others, businesses
D) Depositors with funds less than ?100,000 protected under deposit guarantee - normal John Smith
The trouble is that the first two types, with largest exposure and most to lose, emerge unscathed, and benefit from the 'contribution' of John Smith, who should be protected.
The order of haircut should be the exact reverse, with bond-holders and shareholders losing out, before small depositors.