As a very rough guide to utilities, I can tell you what my partner and I have paid this year if it's any help. We rent a small two-bed flat in south-west london, and rent wise it's roughly the same as what we were paying in halls, maybe about £30 a month cheaper. Our water bill for the whole year was £220, and we've just had a gas and electricity bill for six months which was £160 (we switched to the cheapest supplier we could find but it took ages, hence the double bill). We're budgeting for the same amount again before the end of the year, but hopefully it'll be a bit cheaper. The electricity bill actually wasn't that high, but having gas central heating is expensive.
On top of that we pay about £25 a month for the phone and internet. We don't have a TV so there's no expense there. If we were paying council tax (which thankfully we're not lol) then that would be an extra £1500 per year.
*edit* - I don't think it's actually been any cheaper for me to live in a flat as opposed to halls, although obviously if we'd shared with more people and been prepared to put up with not so nice an area or as much space then it probably would be. In terms of whether I prefer it to halls though, then it's a definite 'yes'! Halls are ok for the first year, but now I have my own space, and I don't have to deal with other people's noise/mess etc ... bliss!