Hi Duncs,
I have used quads a fair bit in Scotland, and some time ago decided to buy a good second hand one.
The first one I bought was a Kodiak auto. Lasted about 3 days and the gearbox siezed. Nice looking bike, but no thank you, got my money back.
I then investigated the whole Quad deal, and ended up buying the same machine that I had available on a lease I ran for nearly 10 years. For me nothing beats a Honda Quad. I bought mine about 3 years ago from Fieldens, second hand, re stoved frame, new tyres, complete overhaul, 3 months gurantee, ex RSPB bike, so it had been looked after.
Cant fault it, I have used it in Scotland and Dorset, and had two Red Stags on it, and three Sika (not all at the sametime I might add).
Honda are probably your best bet. Hope this helps.
Regards
Sikamalc