It seems there's no good way out of this - either I have to pick a random pressure reducer and hope that the balance is good enough, or rely on a valve from the donor which was designed for a completely different weight of car.
I've got an MOT station within 1/2 mile of my house so once I get that far I can see myself taking a quick trip over there (on a trailer of course) and getting them to let me know what the balance actually is.
At least that way I'll have some hope of getting through
Matt
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