Slaughter and May and Sullivan & Cromwell are among four firms that have all won roles on Canadian insurance and investment business Fairfax Financial’s $1.8bn (£1.2bn) takeover offer for speciality insurer and reinsurer Brit.

Under the terms of the offer shareholders in Brit, which floated on the London Stock Exchange last year, will receive 305p a share, a premium of 11% on Brit’s closing price on Monday.