.ac.uk second level domain is part of the .uk Domain Name System.

An organisation may register one or more names in the ac.uk domain provided that it has a permanent physical presence in the UK, and its primary function satisfies at least one of the registration criteria.

For more information on the registration criteria visit www.ja.net

__________________
Domainmonster.com Customer Support Team.
Information & Resources for Domains .

try http://www.zippozap.com/ to do a domain name appraisal to know the true worth of .UK domain