Im not convinced on a catch can James tbh .
I will continue to sit on the fence as to regards whether imo they really need a catch can.
Perhaps when i remove the old unit on friday, if its full of gunk and crap, then perhaps something will need to be installed.
This valve blowing is common as you say for mapped cars especially.
Shes not lacking in power as yet, but i will photograph whats inside it on friday to see whether a can is justified.|(43k miles)
An uprated one would be a good suggestion if it happens again, as its only £28 , i ll give another oem one a go.Part number has had a change in part number on vw's computers. Maybe its an updated version?.We shall see