Ordered its from TX autosport last night.
Will update this thread with how long delivery takes/videos/photos and sound clips (video). I know a few people on here enquired about it, and it might be handy if I started this thread - others can find it on search then.
It cost £76 delivered.
TX Autosport Dump Valve - not the recirc one (atmospheric)
TX Autosport dump valve piping with 25mm outlet
Fitting kit with 25mm silicone, vaccum hose, tie clips, clamps, tpiece
*Bought from TX's ebay store, although the fitting kit was from another business seller, it was around the £10 mark delivered.