Thank you for your enquiry. Unfortunately I do do not have any photos of MGB 56, which was originally building for the French Navy, and entered service first as a Motor Anti-Submarine Boat (MASB 56). It was part of the 4th MGB Flotilla, comprising MGBs 50–57, MGBs 50, 51, 52 & 57 being involved in Operation Jubilee, the Dieppe Raid. There is a film on the IWM web site of the boats returning from a raid on St Cecily Plage
which mostly features C-Class MGBs, but at one point of the flypast shows two early British Power Boat MGBs, which you might ask your grandfather about, in case one of those boats might be 56? We would welcome copies of any photos you have in the family's possession, along with any service details of your grandfather.