Tavistock Investments, an investment advice company, completed the acquisition of a 21% stake in LEBC Group, a financial advisory firm, for £10m. "We are delighted to welcome Tavistock as a shareholder within our rapidly growing business. We expect EBITDA to more than double this financial year and look forward to a long and successful partnership with Tavistock, to our mutual benefit," Derek Miles, LEBC Managing Director.