The Lloyd’s platform of private equity backed Prosight Specialty Insurance is set to add new classes of business and a portion of the US book will transfer to London as it plots expansion in 2012, The Insurance Insider has learned.

The capacity of the group’s Syndicate 1110 has risen from £53mn in 2011 to £80mn for 2012, as Prosight plans to build out the fledgling syndicate and broaden its core engineering focus.