Now for sale! Argos fillet brazed space rocket audax bike of my (broken) dreams

If Frame & Forks I'd expect (given the close clearances that literally no-one wants any more) that it really isn't worth a bundle. £150?

but a very specific touring frame that I've been looking for for years has come up locally

Not an Overbury's by any chance? i note you're in that part of the world...