If you search 'seller' on ebay under 'tophills' you will find him.
I have used this guy, Jimmy, on about 4 occassions now he is in Falkirk, you can either buy a seat from him or do what i do which is to send him my seat (costs about a fiver with Hermes) tell him what you want, i.e mine was to add a foam comfort pad, keep same seat height, recover in basket weave with blue piping and add the fazer and yamaha logo and the cost was £90 + £13pp, usually takes less than a week
he has always done a brilliant job for us on all our bikes in the past
if you cant find him on ebay i will didg out his email address.