By Huw Jones LONDON (Reuters) – Rules forcing Britain’s banks to wrap their retail arms with a bespoke cushion of capital should be retained for now, though they could “ossify” the sector in the longer term if left unchanged, an independent review for the finance ministry said on Tuesday. The’ring-fencing’ rules were introduced for banks with deposits of over 25 billion pounds ($32.6 billion) to insulate accounts from any blow-ups in separate investment banking activities, a lesson from the financial crisis when taxpayers had to bail out banks. Banks wanted the rules, applied by seven lenders,…