Its all over the place, year wise. The tanks only entered service in 1948, however the Cav stopped using the Universal carrier in 1943. Apart from the initial clip, it is possible that the helmeted drivers in the final shot are actually infantry.
Over the course of the 1940s, the Cavalry Corps came into the ownership of a total of 226 Bren carriers, used in infantry formations as troop carriers, mortar transports, and two as experimental flamethrowers by the engineers corps. This number makes it by far the most numerous of any armoured vehicle to serve with the Irish Army