Watson Wyatt & Company Holdings has completed its takeover of London-based Watson Wyatt LLP, it was announced today.

New York-based Watson Wyatt & Company Holdings already owns 20% of the UK firm. It said it would acquire the remaining 80% of the company for $451m (£242m).

The purchase would be paid through the issuance of 11 million shares of Watson Wyatt & Company Holdings common stock and $158m in cash, a company statement said.

The newly-formed company is expected to have revenues of more than £1.1bn.