When I went we got in our room; bed, mattress, wardrobe, desk, curtains. You could buy a 'bedding' pack which included duvet and pillow or just take your own.
Kitchen was a microwave, cooker, fridge and freezer, so I took plates/bowls X2 of each, cutlery x2 of each, set of 3 pans and frying pan, mugs, as well as veg peeler, sharp knife, chopping board, wooden spoon, potato masher and cheese grater. I was in a shared flat of about 5 people, so we tending to share what we didn't have. So someone brought a kettle and I think a toaster which we all shared. I bought most bits from wilko it dunelm mill, but places like Ikea and Argos do back to uni packs and offers go kitchen items. Stuff like garlic press and a melon baller will probably go unused, but things like bottle opener and pizza cutter are worth their weight in gold! Also took a Pyrex dish and a couple of oven trays. Also oven glove 🧤
I was also packed off with a full food shop as well.
If your ds needs extra, he can always buy stuff if he finds he needs it/you can order on amazon and have delivered for them.
Don't forget stuff to personalise room, lamps, rugs, tv/radio, posters, photos's etc. As well as towels, tea towels, bed linen. Stuff like waste paper bins and the normal bits and bobs you have in a generic bedroom.
We didn't have ensuite, and everyone shared the shower room, so used a shower caddy for shower gels, shampoo and could just grab it on the way to the shower. I was lucky that I got on well with flatmates so could leave stuff in the bathroom, but some people found they would take whatever wasn't nailed down.
10 years later my veg peeler is still going strong 💪. Best £1 my mum ever spent 😎