I wish there was some kind of ban on any accommodation booking until the third term.
I agree. It would prevent so many fall outs and scrambling for somewhere to live or finding someone to fill a spare place.
four of the eight in his flat decided to share together, all studying different subjects, but similar in personality - sport rather than clubbing etc.
Same with DD, except for the sport bit 
She seems to have “found her tribe” and has made friends with students who are sociable but not part of the party crowd. They all take their studies seriously and don’t call each other killjoys if someone declines an invitation because they have work to do or are too tired to go out. DD has CFS and her friends have been pretty understanding. Especially as one of her friends also has it.
One slight warning is the 'friend of a friend'. Just because you like your friend does not mean you want to live with their friends. If someone suggests another person it is worth checking that they share similar attitudes to noise, cleanliness, drugs and nouse.
This nearly happened, but everyone vetoed the idea, thank goodness.
She has already signed up for year 2 accommodation and is pretty excited about it. She gets on with everyone in her flat, but is keen to get away from the ones who leave the kitchen like a pig sty. So she is sharing with the three who do tidy up from her current flat, and four from the flat opposite. They socialise together all the time and I hope and pray that there are no bust ups.
I don’t know if their new house has a living room, but a nice kitchen was a priority as they often cook meals together. They have themed curry nights or Chinese nights rather than painting the town red. Three of them are vegetarian and I’m sure that was a bit of an incentive for them to stick together.