Perkins R6 that bud, with vacuum pump,I had one myself! Very rare engine, mine was fitted to a fire pump, make sure to get the radiator plumbed up as you won’t find any spares for it! P6 is a smaller engine altogether and no parts will fit
You blew it Tom ....................Just think, if it hadn't have started it woud have been a RU-vid ''will it start'' first, ....that would have to be worth at least a plaque from YT