Just heard from a forum member in NEW ZEALAND who has sent me a new/old webley spring.! will be with me next week., and so appreciate it.
Will let you all know final results after testing and fitting.

Separate thread (ref tests on different washer replacements available) and stages to fit subject to another thread if anyone needs to refer in case in the same 'novice' position as i was at the start - and want to keep an old and treasured gun in good working condition:
http://www.airgunbbs.com/showthread....-Washer-Advice