The DR650SE was a UK model from 1996-99 only , the TT600 was available for longer but as was the want of the UK Yamaha importer at the time they overpriced it (as they did with lots of Yamahas).
My WR250 is a really great trail bike but they were so overpriced new that hardly any sold as you could buy a DRZ400 for less money at the time .
Honda UK were twats in the 1990/2000's as they didn't make bikes like the XR400 road legal from the showroom. Owners had to make them road-legal themselves and they didn't get a warranty from Honda otherwise thousands more XR400's would have sold here.