The problem is then its not really a tried and tested set up.
Who's aren't?
VW Racings?
I would trust a kit designed for UK roads over a generic lowering kit designed for billiard table smooth Autobahns anyday.
Every VW Racing product I've ever tried has worked faultlessly and after speaking to the lads there, the depth of knowledge is way over and above what you get at your average suspension seller.
Having changed springs/dampers or both to alternate springs/dampers or decent coilovers on most cars I've owned in the last 15 years...I'd say the VWR springs/ACC dampers is up there with the best.