Allen & Overy (A&O) is advising Royal Bank of Canada (RBC) on a €838m (£692m) deal to buy the remaining 50% stake in its City-based investment management joint venture RBC Dexia Investor Services.

The deal, which will see RBC take full ownership of the business, was announced last week (3 April) but is subject to regulatory approval and is expected to close in mid-2012.