If you consider Lindstrands / Halvarsons, stockists are relatively few and far between and Sports bike shop don't stock these, but in Boston there is also the following, good guys who really know the products and are very helpful.
J&B Motorcycles / Branded Biker
Unit 3 Holland Units
Redstone Industrial Estate
Boston
Lincolnshire
PE21 8EA
Tel: (01205) 356767