For Sale; Early '90 Carrera Bike

I have for sale my 20+year old carrera bike. I have just had a new bike built for me and the veteran bike engineer suggested I should advertise my bike here, as it has a classic and desirable frame. I don't know much about it. Except that, is is a 19" frame (which always has been a bit big for me). I bought it 16 years ago second hand. I refurbished the bike 5 years ago, so the original grey/purple paint job is gone.Most parts are the originals, except over the years I replaced the following : chain, pedals,seat, tyres and a few spokes(not the wheels!) and brake pads.I have no idea what is still worth but, I would think that the frame at the worth maybe £75..!? Or someone perhaps would make a sensible offer !?
My location is Southampton,Hampshire.