Ashurst Morris Crisp has won the beauty parade to advise joint venture company, Cross London Rail Links (Crossrail) on the development and implementation of two major new rail projects in London, in a deal that could be worth up to £11bn.

The firm was appointed at the end of last year, beating a number of other City firms including Allen & Overy and it is believed Freshfields Bruckhaus Deringer and Clifford Chance.