Thanks for the replies and comments.

I have decided to keep it original and have purchased a full rebuild kit from Rob Lane (already have it, superb service from Rob) along with one of his quick fill adaptors and pressure gauge to set the regulator. I also got some O rings from Air Arms to give it a full service.
Once rebuilt I'm not sure whether to put it back into it's original Blue stock or carry on trying to get used to the aluminium stock that I bought from a chap called Chris Whytock. (some thing like that. It was 12 years ago)

With regards to the parts, I have managed to refurbish the breech shaft and the side plate will need painting, but that's not on view when in the stock. I have contacted Air Arms spares but they have not come back to me yet.

One thing I would like to find is an original wood finish laminate stock so I can keep the Blue one in it's current condition as there does not seem to be many about now.

Cheers

Pete