http://www.premierbikes.com/Never used them, mind...but most TRF members seem, sooner or later, to get a 350 or 400 KTM.
To be honest, the only Japanese offerings for the trail bike market at the moment are the Honda and Kawasaki 250s.
Of those two the Kawa has the most potential as a trail bike, but the Honda is the better all-rounder and has the better residual values. Far more of them about, too.
Top tip...if you buy the Kawa and it seems gutless, there's a little switch under the clutch lever that can be disconnected and this will restore the 'go'.
NSL Motors at Weyhill Service Station are Fantic dealers, and the Fantic trail bikes are very good.
Gordon Farley in Guilford are GasGas dealers, and GasGas make some good bikes too.
BikeTech in Wiltshire do GasGas, AJP and other stuff too. They are a very good dealer.