At the heathrow show last year, I had a demonstration of Shunyata Hydras by Stuart at Audio Atmosphere.

I believe Stuart is the UK importer/distributor.

I personally couldnt hear much difference going from a stock power chord through a 4-way to a shunyata hydra through its own distribution block...

However, ignore my feelings on it and try for yourself.. Anyway, give him a call perhaps he can lend you some to try..

Cheers

Chris