I bought a jacket last october - and it is excellent. And (as it doesnt have the gortex), very reasonably priced (and still waterproof). But it was a nightmare trying to get one.
At the time they were imported by Yamaha, and I rang Yamaha UK to get a list of stockists, and there werent many. And quite a few were stockists, but didnt actually carry stock...
Things have almost certainly changed since I bought mine as Yoko were in the process of changing importers (away from Yamaha), and so some dealers were running down stocks.
DISCLAIMER: The following info is based on my memory and my GPS log !!
It is therefore quite likely incorrect.
The place with the largest supply of clothing (but only the top end of the range and at full list) was:
Motorcycles & Moore
166 High street
London Colney
St Alban
Hertfordshire AL2 1QF
Line 1: 01727 824248
Line 2: 01727 824250
http://www.motorcyclesandmoore.com/
The place I bought from (stocking the cheaper stuff, and had a small clearance discount at the time) was:
Haslemere Motorcycles.
11-15 Weyhill, Haslemere, Surrey
Tel: 01428 651580
Fax: 01428 654736
http://www.motorcyclesandmoore.com/