UK have no draconian measures, register what you like as long as you are not cybersquatting.
2 good .co.uk registrars:
[easily.co.uk...]
[123reg.co.uk...]
hope that helps.
Shak
you should be able to host the .co.uk domain on US or UK servers without any problem.
www.nic.uk has the basic rules for domain registrations. look at the list of members and register your name through one of them. check the terms and conditions carefully prior to registering the name as some companies have hidden costs and restrictions on transfers etc. any company offering domain names for 1p is most likely to have loads of hidden charges. look to pay no more than £10 for 2 years, fully inclusive, with free transfers etc.