IKEA SVARTA bunk bed frame. We bought these bunks second-hand a few years ago and a few of the screws were missing or damaged then. I've ordered spare parts from IKEA from what I can remember needed replacing while I was dismantling it, but you may want to put it up first and see if you need to order any more from them before using. Base panels are slightly bowed but it doesn't affect use. Assembly instructions can be downloaded here: https://www.ikea.com/gb/en/assembly_instructions/svaerta-bunk-bed-frame-sil...
We also have one single spring mattress (not from IKEA, and not the one in the picture) that you're welcome to take as well, which is in fair condition but the springs have seen better days to be honest.
Collection only AL4 (Marshalswick). Feel free to take just for parts or for repurposing/upcycling. Happy to drop off the spare screws locally (St Albans only) if they arrive after the bed's been collected.