Hey,
All of the accommodations I visited and had friends at were pretty similar in terms of social life. They all hold socials and have reps to run events throughout the year.
I think it's sadly the luck of the draw as to who you get in your flat/corridor but even if you find the people directly around you aren't that social etc you can get to know the people above, below or in opposite flats/corridors.
From my experience, SPC was really social and there was always something going on. It is also probably one of the most diverse halls, along with Nottingham two, that I know of but this might change from year to year.
Wherever you one up just make the effort to knock on peoples doors and invite people round or out to whatever you are doing, especially in the first few weeks. This was one of the main way me and my flat made friends and I am still really close to some of the people I met during this time.
Hope this helps,
Emily