Hiya,
I'm going to extrapolate a bit!
1 bed flat, just outside of city centre, midrange approx £575-600 pcm. perhaps £70-90 pcm Council tax (estimate) and perhaps around £80-100 pcm for Electric, Water & possibly gas utilities, again rough estimates. Food (big estimate!) £80-100 per month. So around £850-900 p/month for living.
Car - lets say you do spend around the £250 for a lease. That should include all servicing, and depending on the deal, insurance, breakdown cover. It'll exclude fuel. Another big estimate here - £100 per month on fuel? - so £350 per month car travel.
Financial aspects - Savings, I think I read somewhere the average amount put away in the UK by it's population is something like £50 per month, the figures are skewed, in that there's a vast amount of people who save absolutley squatt diddly and another demographic that puts away substantially more. Single person, I'd say try to put in £75-100 into an ISA or High interest savings account. Perhaps a similar level into a Pension pot? - Think about things like house and contents insurance, perhaps also things like salary protection schemes in case of job loss etc. £175-200 per month in this area.
Phones, Internet, TV license - PAYG £20/month if you dont immediatley get a contract, 3 PAYG USB mobile dongle Internet £15/month again assuming you dont immediatley get a contract, and if you do, that's a good amount to get potentially a upto 8MB internet package the £25 one you mention is what I'll go on here. TV license is I think £155 per year? not sure so about £12-13 per month. total of around £60 per month.
Eating out a few times a week - nice decent restaurant £10-15 each visit for yourself - £120 per month @ £10 per meal/visit.
Drinks - 2/3 drinks at a trendy, cool type place - cocktail or spirits type trendy £4-6 each drink - approx £20 each evening out - £80 per month
So far around £1660-1700 per month in expenses overall from just the above. That'll equate to a salary of £1700 take home pay which before tax would be £27K.
I'd also put forward many of the lifestyle options you've not included - clothes, entertainment (CD's, DVD's Cinema etc), holidays, visiting other areas of the UK, etc - so perhaps another £2-3K required overall for those aspects. I understand however you 'could' spend on those out of the savings example above!
Does circa £30K tie in with reaslistic earning levels in the type of job/career you can aim for with your experience?! also, perhaps my initial extrapolations are a bit off, but they're a starting point! by the way, Average salaries in the UK are around the £23K mark, so you'd be needing to be earning substantially more than that level.
Hope this helps a bit !
Cheers, DtM! West London & Slough UK!