@Pumpkintopf I think all of UCL Halls are within walking distance of the Uni. I did Medicine which had a fantastic freshers week and everyone met in the America student Union the night before where we had a buddy who told us about the ropes and my buddy was supportive throughout his time there.
As a medic we spent so much time in lectures and practicals I think it was easy to make friends. As it was right in the centre of London, we walked everywhere and met students from all over London in any club or bar we went to. In fact I thought London was full of students. The student Union is a social hub with the famous UCL cocktail nights on a Thursday where we got to meet people from all the university of London.
We waited in line for cheap theater tickets and there were plenty of cheap eateries. Bought a bottle from Budgens and got drunk before we went out so we didn't need to buy drinks at the clubs. In fact once I chose to freeze instead of taking a coat and paying for the cloakroom. We wouldn't even spent £1.80 on a tube fare. Went to clubs before a certain time when it was free and on student nights.
I didn't feel any lack of community at UCL. As I was too into partying I regret not participating in student sports which is something I was really into as a schoolgirl but the opportunity was there.
We had student grants those days which j used for my living expenses and my parents always paid for my accommodation. I also won some money in academic prizes which helped me as well. In fact my student loan went towards my first car.
We used to go to Imperial college once a year to attend one of their balls and in fact I went to one last year before lockdown happened.
If you have any specific questions please ask.
@bendmeoverbackwards also went to UCL and may have her own input
I do think a university outside London is different to one in London though and my DH is quite keen our DS goes to a non London Uni although two of his choices are London