Didn't even have friends when I moved, got a bedroom in a shared house. £425 and today with inflation you can find similar for £500-600 a month across most of the UK outside of cities anyway. That is bills included.
So the only essential spending left really is food. Currently that costs me about £60/month from Aldi but I am earning more now. If I had to cut back I don't know exactly how much I could reduce it to. £30-50 would be pretty easy to cut back to by cutting out meat and cheese while £10 would be high carb poverty food and possibly scurvy.
The rest I saved or spent on fun things. Life was pretty good as I made friends with some of the other guys living there. Moving house I did with a bag and a few bin liners, I barely owned anything in the first place so I just carried stuff and took a train.