Thought I'd chip in as a Brit in the US...
The UK has lots of good music - you just have to go looking for it.

Of course, London's the epicentre of everything, and you'll find all kinds of music there - make sure to check Time Out (
www.timeout.com/london) for the gig listings. It's not the cheapest place to live, but most big cities aren't (take a look at NYC, for example - almost certainly more expensive than London too). Depending on your line of work, there's lots of well-paid work in London to sustain your music habit, and loads of other stuff to do - lots of good food, there's the West End for your theatre fix, and lots more. Plus, there's one of the world's best bass shops - The Gallery - in Camden Town.

Paid gigs will be the usual function/wedding/covers fare - there's lots of places to play, but unless you're playing corporate gigs for big companies on a regular basis or playing in the pit for a West End show, don't plan on making a living from it. I do know quite a few people back there who *almost* manage it - they live in small flats or flatshares, work part-time and dedicate all the rest of their time to music. This is perfectly doable, especially if you're not living right in central London. For some other hints and tips, head over to Steve Lawson's forum - he makes a good living from playing and teaching, and lives a nice London lifestyle.
Moving away from London, Birmingham's got a growing music scene that's worth investigating, Manchester used to be a hotspot for music, but has kinda lost its way a bit (kinda rough now too), Leeds is great if you like rock/metal, Oxford's gorgeous and fun, with lots of music to listen to, Cardiff in Wales has a huge music scene (some are saying that Cardiff's the new London as far as music is concerned), Glasgow has its own little scene, Bristol's always been a good town for music (Portishead/Massive Attack/Tricky, etc)... the list goes on. A safe bet would be a town/city with a university, as they always seem to have good music scenes. All these places (with the possible exception of Oxford) will be significantly cheaper (and friendlier) than London, although bear in mind job salaries won't be as high in most of these places. To get a taste of the types of bands you'll find in each area, look through the musicians sections on
Invalid Link Removed (more or less the UK equivalent of Craigslist).
The cost of living in the UK is maybe a little higher than most of the US (but not everywhere - here in NJ the cost of living is actually higher than the UK). Direct taxes (ie, income and sales tax/VAT) are somewhat higher, but there's a lot less in terms of capital taxes, such as on savings or property. You'll find the supermarket food's a lot better, you'll have better access to public transport, there's lots of places to go drinking if that's your thing, healthcare's free at the point of delivery, if you decide to buy a house there's no property taxes (just council tax that everyone has to pay, buying or renting), you'll be able to get out and walk a lot more than you'll have been used to in the US, Coke is made with real sugar instead of HFCS, McDonalds sell salads and relatively healthy sandwiches, and the scenery is fantastic.
In terms of accommodation, yes, the houses are smaller - land is at a premium in the UK compared to the US. But houses tend to be more solidly built - all masonry, bricks, slate and tile. You won't find any wood frames, vinyl siding or asphalt roofs in the UK, except on garden sheds.

You'll be able to rent a half-decent flat within easy reach of London for £600-800 a month (more if you need more room). On top of that, your typical utility bills will be electricity, gas (if your boiler and stove are gas-powered), water rates and council tax (pays for rubbish collection, local roads, local police, etc), ISP costs, mobile phone (get a pay-as-you-go phone to start with), and your annual TV licence, which basically pays for the BBC - seven TV channels and loads of radio stations, all with no commercials and relatively high-quality programming compared to the commercial stations.
If you're intending to drive, motoring is very different in the UK. Apart from the obvious driving-on-the-left thing (just remember, you're sitting on the side of the car nearest the middle of the road), petrol/diesel is much more expensive, but you'll find most people compensate by driving smaller or much more fuel-efficient cars - you can get some cars with small diesel engines that get 70+mpg - who needs a hybrid? For the most part, only rich peple drive SUVs, and you'll hardly see any pickup trucks. On the plus side, because cars are viewed as a luxury rather than a necessity, cars tend to be better built and more lavishly equipped, car insurance is very cheap compared to the US, and you'll find motorway (highway) driving to be a lot less intimidating, despite the higher speed limit - people tend to have better lane discipline, actually use their turn signals, and trucks are limited to a maximum of 60mph so they can't scare the crap out of you by overtaking you in the fast lane.
Culturally, most Brits know a lot about US culture (we're inundated with it from an early age), but in my experience, most Americans know very little about UK culture, and most of what they do know is probably 30 years out of date - might be a good idea to read various British sites (BBC, any of our newspapers, etc) and get an impression of our culture, famous people, TV programmes, our sports teams and stuff like that. Learning about football in the UK is an easy route into a conversation with almost anyone you'll meet - they'll be impressed at finding an American who doesn't think football involves shoulder pads and an oval ball.

We're also sticklers for British English - we all know the US terms for things (eg elevator->lift, faucet->tap, sidewalk->pavement) but we prefer you use the British terms, and spell things the British way.
Also, as a general guide to being an American in the UK, Brits generally quite like the guy who's in the White House now but we all hated the last guy, we're mostly quite secular and don't talk about religion much, and we don't have a lot of time for patriotism, unless England are playing Germany at football.
My personal recommendation? Don't live in London, but live somewhere where you'll have reasonably easy access to it - more or less anywhere in the Home Counties would fit this description (the "Home Counties" are Essex, Middlesex, Buckinghamshire, Hertfordshire, Berkshire, Kent, Surrey and Sussex). They're all within an hour's train ride of Central London, and cheaper and prettier than the city, with more space, so you can have the best of both worlds.
