By Huw Jones LONDON (Reuters) -Britain will unlock “tens of billions of pounds” of insurance sector capital that should boost the economy through infrastructure investment, financial services minister John Glen said on Monday. The six-year old ‘Solvency II’ capital requirements were inherited from the European Union when Britain left the bloc’s orbit at the end of 2020. The long-flagged reform is seen by insurers and Brexit supporters as an early test of how Britain can exploit its freedom to write its own financial regulations, and the government is keen to show tangible benefits from leaving…