I would get a Single Edge (SE) razor first. I know a few guys in your area who would part with one for something like GBP 10 including a fistful of blades. If, and that may be a big if, you manage to get comfortable shaves out of an SE, you can do it with a cut-throat. SE blades are quite stiff, and in my experience the closest to a cut-throat shave, but are guaranteed to be sharp out of the box.

Unrelated, but maybe of interest to you, Scottish Fine Soaps have an outlet in Dunfermline. When I was there, they sold unpackaged, unstamped shaving soaps for 20p. Might be worth a visit.