Cameron achieved very little in his tortuous negotiations in Brussels to change the terms of Britain’s membership of the EU. One thing he did achieve though was protection for the City of London and particularly HSBC. As I have pointed out, Cameron is deeply beholden to HSBC, not least because of his cover-up of the Office of Fair Trading order, made at the time he was making the bank’s chair Stephen Green a Lord.
This is from the EU Council conclusions to the meeting, basically a ringfence for City regulation:
And more specifically for HSBC – this was in the Guardian before the negotiations
And this, from the Telegraph report of the conclusion