@gillian – don’t you just throw your sharps in the paper recycling bin? That’s what I do.
I sometimes go round the back of the counter in my local pharmacy (I’m friends with the pharmacist, I don’t just wander round there) and look at the needle exchange kits. The needles are MASSIVE and euphemistically labelled with “diabetes supplies” on them. Heroin must really be great if people want to use such enormous horse needles!