UKnames.net
Site offers domain name registration service for UK and US names.

Universal Domains
Domain name registration, trademark check, unregistered domains and name appraisals.

USP Networks
British-based domain name registration and web hosting service.

USDomainRegistrar.com
Free domain name registry service for .com, .net, .org. Also assisted registration by phone or email. With a glossary of domain name terms and discount off of Internic filing fee.

Uniis
Offers name registration, including the .US domain.