UBM = United Builders Merchants. Long since gone the way of most old British companies. Valve will actually have been manufactured by some other old British company and simply "badged" as UBM. Forget about getting hold of one today, just replace with a Thermostatic Rad Valve of your choice.
He was aware (he tells me) of replacing the whole valve, but he was hoping to simply buy replacement valve, and only use the top half - thus eliminating having to drain down the system!
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