Jack Dickinson says:
It's an old 70's jobbie, sounds lovely cranked but it's a no name company, Regent, so possibly a home made one originally but its been serviced etc I don't want to sell it but I also do want a new bike frame
as long as it is valve then you should be ok. i'd say get as much information about it as you can. email a few techs.
google Champ Amp Nottingham. it'll give you something like www.chambino.co.uk he knows his stuff. then do the best ebay advert you can.
I've always found the better / more informative your listing the more people are interested and the more people bid.
also, check out a couple of internet forums for new / second hand frames, i go on singletrackworld and have found no end of bargains on stuff.