Just an extra note about council tax - if you live alone, you get a substantial discount.
25% to be precise.
The best way to figure out your council tax is log onto the local authority's website (use direct.gov to find this) where you will be living - or estimate and look at a few in the areas you're thinking about. Check their rates - a 1 bedroom place should be Band B. A small 2 bed will like be Band C. Look at the rates for the year & to figure out what you pay monthly, take 10% of that (for some reason, councils like you to pay over 10 months & then you have 2 months where you get a break). For instance, I live in south London & we pay £96/month for our Band B 1 bedroom flat. However, the range in London alone can be anywhere from £110/month to as little as £60, depending on your council!!
To get internet, like springhaze said, you either have Virgin Media cable or any other provider which is 'broadband'. Any non-cable service requires a BT phone line, which is £11/month (there's no choice here - if you don't have Virgin, you HAVE to have a phone line and pay line rental). Some broadband providers offer a package service that will give you phone + internet (including a line rental) for slightly cheaper so you can avoid that £11.
Utilities: the council pays for sewer, so count that as a service included in your council tax bill.
Water is charged separately & isn't something where you can choose your provider. Obviously rates vary across the country, but we pay £20/month flat. A lot of places in cities (like ours) don't have meters, so they just estimate your usage based on # of people/size of place.
Electricity and gas can be bundled into 1 provider or paid for separately by different providers. A lot of providers provide discounts if you take both services with them. Try
http://www.moneysupermarket.com which offers a comparison service of all fuel providers. What's great is you have TONS of choice and can really research to find the cheapest provider in your area. It's really easy to switch your fuel provider, so even if you move into your flat with 1 provider, you can then research, find the cheapest and then switch. Just to give you a rough idea, we're 2 people who work full-time living in a 1-bedroom flat and our electricity + gas bill is £40/month (however this fluxtuates depending on the season - obviously is higher in winter!). The type of heating in your property will obviously influence the bill (gas central heating is more efficient than forced air, etc.)
TV license is currently running at £11.95/month and is mandatory.
Renter's insurance...shamefully not something I have :sheepish:.
Estate agent's fees: roughly 1.5 months' deposit, which is held in a secure bank account. 1 months' rent in advance to secure the property. Then an estate agent will usually charge referencing fees (roughly £35-50pp) and an admin fee (huge range - anywhere from zilch to hundreds of pounds!) to move in. Keep in mind that unless you move to the UK with a job already secured, you will 'fail' the referencing check and be required to supply either a guarantor or a huge deposit (something 6 months' rent in advance) before a landlord will rent to you.
Anything else?