Stafford Guitar Centre hold a range of quality instruments by British Makers as well as other good classical guitar. If you don't want to go there, they (at least they used to - I haven't checked the web site recently) would send one to you for trial and you could return it if you didn't like it. But if you don't mind the trip over there they're very helpful.

There are also individual makers within distance. Peter Barton in West Yorkshire makes classical guitars amongst others (Kate Rusby uses his acoustics). Nicholas Scott in Chesterfield makes Smallman-type guitars (and maybe others). (Problem with going to makers is that you may have a long wait. On the other hand you can get what you want)

Guitarnotes in Nottingham, as well as being the mail-order supplier of classical guitar music, also sells guitars.

Hope this is of some help.

Mick