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ARGHHHHHH ... swapped it out (fitted perfectly) and it's leaking from the threads !!!!!! The new part comes with an O ring seal .... how tight should it go ????? E2A: OK, so removed, checked all threads were OK (they were) and replaced but was a little less cautious about tightening...

Cheers guys. Managed to order the part at a ridiculously low price via eBay https://www.ebay.co.uk/itm/Vaillant-Turbo-Max-Plus-824-828-837-824-2-838-2-E-Bottle-Air-Vent-061707/331398532481 Arrived today, so will fit it when possible.

Last week I fitted an external expansion vessel to my Vaillant CH system. While I was there, I flushed and re-inhibited the system. Having been bitten before, I pressurised the system initially with just water - fired up - no leaks. Great. Added flush, ran system for a couple of hours. Fine...