If you are at all worried by US/US taxation I have a simple suggestion. Buy some
software to help you. Turbo Tax can handle foreign tax and tax credits nicely.
I know I just did it. I use it to do my regular US taxes, but I just tested out
how it handles income from foreign sources and it works really well.
The UK side of things is not as well developed, but I'm betting many people in
the UK will have had tax taken out at source so won't need to file a UK form.
If you do (ie if you have income from outside the UK) you can do the online
self assessment at
www. HMRC.gov.uk
I haven't used this yet, but I have downloaded a demo version of Forbes Tax pro Software
that covers everything you'll need. I has a wizard like Turbo Tax that asks you questions.
There are many more UK tax software packages at this link
http://www.hmrc.gov.uk/efiling/sa_efiling/soft_dev.htmSo why not get your dcumentation together and sit down for a couple of fun evenings.
The total cost of the software will probably be $100-$150, but for that you get to do your
taxes and learn a lot too.