Special focus: Banking 2008 and beyondBank valuations are at 10-year lows, while capital injections from private equity firms and sovereign wealth funds are drying up. In order to shore up balance sheets and return shareholder value, will they be forced to sell the crown jewels, or should they change their business models? Helen Avery reports.IN A SURVEY by Allen and Overy of chief executives of FTSE 350 and Fortune 500 companies in the summer of 2007, 21% of financial firms said they expected demerger activity in their sector before the end of June this year. Only in the technology, media and telecoms sector did chief executives foresee greater demerger activity. Demergers seemed the likely route as large financial conglomerates were faced with having to improve their balance sheets. A decade of merger activity had led to inefficiencies at the firms, and streamlining to unlock value seemed certain. Buyers were thought...