What I've found with web usage surveys on .UK is that most of the active .uk registrations are actually redirecting to the equivalent .co.uk website. In effect, the .uk subdomain has become a brand protection registration. While there is some use of the .uk, it is massively overwhelmed by the numbers of active .co.uk websites. The ideal sales package would be the .co.uk and the .uk rather than simply a .uk domain name. Think of it as selling a brand rather than selling a domain name. The one thing that businesses hate is a compromised brand. While the .COM is still a major part of the UK market, there's an psychological effect with end users where if someone mentions the left of the dot name (no .co.uk etc), the end user will automatically assume that it is a .co.uk domain name.This also happens in other ccTLD dominant markets where the local ccTLD is the main TLD.
Regards...jmcc