Thanks Mick,
You didn't need to go to any trouble though.
Looks like the sharp style square receiver cover and still be bought over there so hopefully other parts will be too.
From the photos I actually like the look of the rifle as is so I'll get it up and running first as it is currently part stripped and was leaking previous to that and then see what to do with it.
There has been some very helpful info from everyone so thank you all.
johnj.
Webley Excel, Webley Tomahawk, Air arms khamsin, Air arms Pro Sport, Bam B26-2, Bam B45-3, BSA Mercury, Sharp Innova (licenced Indonesian version).