Further information provided in respect of 801 Flotilla.
801 initially formed at Richborough - HMS Robertson under Dover Command. This was a holding base for Royal Marine Landing Craft Personnel. In October 1943 moved to Newhaven - 801 Build Up Flotilla. Stationed HMS Newt under Portsmouth Command remaining there until April 1944 moving to HMS Northney Hayling Island. The Flotilla consisted of 16 LCV(P).
801 were an operational unit but not used on operations until D-Day eventually crossing the Channel and worked Juno Beach mainly to ferry supplies and general workhorses from the larger ships offshore.
However, prior to these operations dad had moved on to HMS Copra in March 1944.
Look forward to hearing further if anyone can add more information...