The Loyd Carrier was built upon the mechanicals of a 15cwt 4x2 Fordson 7V truck with mild steel bodywork to which armour plate - 'BP Plate' - was bolted depending on application. The engine was at the rear of the Carrier with the radiator behind rather than in front. The transmission then took the drive forward to the axle at the very front where it drove the tracks. Both the front drive sprockets and idlers at the rear of the tracks were fitted with brakes, actuated by a pair of levers by the driver. To turn the vehicle to the left, the brakes were applied on that side and the Carrier would slew round the stopped track. The upper hull covered the front and sides but was open to the rear and above; as the Carrier was not expected to function as a fighting vehicle, this was not an issue. To protect the occupants from the weather, a canvas tilt could be put up; this was standard fitment from the factory. As part of the rapid development program, the Loyd used parts from other vehicles: From the Universal Carrier, the track, drive sprockets, and Horstmann suspension units; from the Fordson 7V, the chassis, engine, gearbox, torque tube and front axle. The brake drums and back plates were designed specifically for the Loyd. The Army tested the Loyd Carrier in 1939 and placed an initial order for 200 as the Carrier, Tracked, Personnel Carrying i.e. a personnel carrier. Initial deliveries were from Vivian Loyd's own company, but production moved to the larger firms, including the Ford Motor Company and Wolseley Motors and Dennis Brothers Ltd, Aveling & Barford and Sentinel Waggon Works. Total production of the Loyd Carrier was approximately 26,000.
Early in the war, the TT along with the TPC variants were part of the standard equipment of Royal EngineerChemical Warfare Companies. Most of the Chemical Warfare Companies were disbanded or repurposed in 1943 in order to free up their 4.2 inch mortars for desperately needed conventional use by infantry divisions in-theatre; the mortars and supporting equipment were attached to each division's machine-gun battalion in company strength. By far the most notable use of the Loyd was in the TT configuration, where it pulled the 6 pounder anti-tank gun from the Normandy landings of 1944 through to the end of the war. There are many wartime photographs of Loyds in action in Normandy, and a number were photographed destroyed in the well-known battle of Villers-Bocage in 1944. The Loyd Carrier was also paired with Caterpillar D8 tractors in service with Royal Electrical and Mechanical Engineers for tank recovery - the Carrier carrying spare equipment for the tractor.
Post-war
Both Belgium and the Netherlands bought Loyd TTs from the British Army; they were still in Belgian Army ownership up to at least 1963 as engine rebuild plates have been seen with this date in original Belgian vehicles. A Belgian variant was the CATI 90, a self-propelled gun in use from 1954 to 1962. The vehicle served in infantry units with a paired ammunition carrier. Some vehicles were sold on into private ownership for farming use and a number were placed as targets on Belgian ranges.
Variants
Loyd carriers were available in three "numbers", which were available in two "marks"; all manufactured during wartime, and varied in the type/sourcing of the flathead Ford V8 they were powered with:
There were not many differences between variants, mainly seating and armour plate location: ;Tracked Personnel Carrier ;Tracked Towing - Initially known as 'Tractor Anti-tank, MkI' ;Tracked Cable Layer Mechanical ;Tracked Starting and Charging
