Land Utility denotes an agricultural type tyre and normally the tractor so fitted, I believe. The tractors shown in thread and on face book have double fillers for petrol/tvo and appear to be standard agriculture tractors as also used by the RAF. Early, and later, RAF Fordsons were based on the industrial chassis with forward driving position, LU tyre equipment, no mudguards, under slung exhaust, lights and horn powered from a battery only, single filler for petrol and therefore a straight petrol engine with gauze type air filter. They were capable of around 30 mph when fitted with 28" rear tyres............. scary I reckon. See Vintage Tractor Special no.s 4 and 11, by A T Condie for more pictures and information.