Thanks for that.

I have a few old tins kicking around, unlikely to get used. Also a small cardboard packet of pellets purchased in Indonesia 20+ years ago unopened and not spotted since.

Then there's 'The File' An A4 lever arch file with just about every document I could get my hands on circa 1985-90, that's like a treasure trove of plans, ideas, newly invented gear, catalogues, etc...