Oh dear, had a walk into town this morning and came back the owner of an HW35e in .177 flavour. Recently sold to our local gunshop by a farmer who was retiring and had bought the rifle new for his son 30+ years ago. Some interesting features which I could do with advise on though:

No serial No.s on back block or barrel (no Hull cartridge marking either)
Back block has two indents for sight fixing
Double sided safety

I'm thinking early 80's so maybe a sythentic seal piston

I'd welcome peolpe's thoughts

I recently bought an old Mk2 Airsporter from said RFD and whilst in discussion with him today he wandered into his stock room and came out with a boxed Airsporter in .22 (maybe a Mk5 / 6) still with the oil bottle. If it was of interest to anyone, PM me and I'll forward details.