I have had a pile of scrap pipes and fittings accumulating behind my garage
for a few years. Maybe 15-20 kilos.

Took it to the non ferrous metal merchant yesterday and he gave me 55 quid!
Staggering. I shall be having an unscheduled curry this weekend as a direct
result.

I must have the same amount of copper again if I dig around. There's good
value in those old pipes.