IGP50, I'm going camping at the Dunsfold Collection tonight actually so will ask around and see what they say.
Thanks for that pointer Patman, I'll give them a bell.
Recently I went to the first cheap tester near me and got comments like "I should really fail it for that sump leak", "for that front diff leak", "for that rear diff leak", for "that fluid coming out the wheels" - okay, I get it, it leaks

!!