I did mainly shop work for the people who were asking, i do know some people who've done bar work as well. I was working in a shop and for an IT company that relocates offices (evening work on the weekend) and was doing 8-16 hours a week term time and then 40-50 hours a week in hols (when not on EMS). It is definately doable, you just have to be organised with your work and do it in the evenings during the week as you are at work on the weekend, also you dont get to go out as much as other students but that saves money too!
Transatlanticdrawl, I know it does sound a bit crazy, but if I can do it anyone can, I'm not the most organised in the world. Also, if you cant pay the bills without working you don't have much choice, for me it was either do paid work and not get a merit/distinction and be able to have someone to live and eat, or dont work, get better grades but not be able to live/eat.not that i have bad grades, its just there are some people at uni who literally do nothing (at all) other than uni work.
About the summer, this will sound harsh but get a really crap job e.g. supermarket or a shop and just dont tell them you're going to uni, then hand your notice in when the time comes, that way they will be more likely to give you a full time position.
About a car, you dont need it in the first two years but i would say its essential for the last three, even the RVC acknowledge this! i agree with Hel' in Heaven, there are a few but not many and it does cost more. I am living and commuting in PB and it is still significantly cheaper than staying in a B&B, as if you go and stay somewhere the rent/bill stil have to be paid.