Depends where in the UK! https://www.oxford.gov.uk/info/20074/recycling_advice/25/wha...
For instance it doesn't say if I can recycle nuts and bolts. Rather than just adding that to the list though they could say something like "all items primarily (99% of more) made of metal between 50g and 10kg" or whatever their actual criteria are.
Let me just look around the room and see all the items that list doesn't cover: pewter mugs, large steel ball bearings, vinyl film backing paper, screws, middle bits of sellotape, bike brake cables, empty metal epoxy containers, etc...