There's always money in breaking engines, whether it sells or not is a different question. Quick scan of EBay suggests parts for Evinrudes of this vintage are pretty much all state-side. I would have thought there was limited demand here in Blighty!
The things that still have value will be the flywheel (you'll need a puller to separate), carbs, starter motor, wiring loom (starter/distributor/coil), head assembly, etc.
The aluminium propeller is suffering from the beginnings of cavitation holes caused by bubbles with the usual nicks on the blades. £30 tops, and that's for a tidy one.
Is that with or without VAT?