Shamus (1958, John Francis Rooney, Tiny Littler)

Fantasy comedy (not the Burt Reynolds movie, but made in Ireland, and yes the leprechaun is played by Tiny Littler), features footage of Ulster Transit Authority 8846 (MZ1917), a 1949 Leyland Tiger PS2/1 with UTA body, shortly before it was rebuilt as a Leyland PD2:
I would be fascinated to learn what this is, in use as a roadside cafe: