I just bought a random on eBay. 5 years later and on ever day it’s fine.
If you want something from the UK with a backing behind it I think our sponsor @xtreme engineering does them.
Fatherly advice on the label.I bought the a generic 240V solenoid/timer one from ebay - for my airtank drain..
But I have fitted these on the bottom of DropOut fitlers - "float drainers" - they dirt cheap and they work OK (don't leak)
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Advertised on amazon. Cheap enough. Also can wire them after pressure set so will run for desired time period every time the motor cuts in rather than on a timer. This works well if don't want it going off every 45mins.