Griffin Group Plc, financial services and investment banking firm is going to buy Alexander David Holdings Ltd, broker and adviser, whilst selling off its division, Griffin Group Holdings, at the same time.Griffin will buy Alexander David Holdings for about £4.8m in a reverse takeover with an initial payment of £3.9m.Griffin's subsidiary is to be sold to Global Investments for £1.2m. Griffin's chairman, Stephen Dean, has an interest in the company.