Initially designed for commando type raids from a base in Britain as a way of probing enemy defences and tying down additional troops, some were converted into fire support vessels.
This was a Landing Craft Support (LCS) boat fitted with extra weapons to give fire support to landing craft particularly in being able to provide some anti-tank capability.
This was achieved by the simple expediency of mounting a tank turret complete with its 57 mm 6-pounder gun on the forward deck.
Ten of this type were ordered from May 1942 onwards, assembled at the boatyards of six separate contractors from the kits provided in the same way as with other Fairmile craft and numbered "LCS(L)(2) 251" to "LCS(L)(2) 260".
The usual Fairmile construction techniques were used with all items prefabricated and supplied in kit form to boatyards for assembly and fitting out.