I think .co.uk domains can be valuable, and can be ideal for potential development if you find the right buyer/target/industry.
In my experiance of using them and watching them however, I wouldn't be too big on purchasing them for reseller purposes. I think .co.uk extension domains work out best for End-User selling, if you can manage it.
Overall, you've got a great domain name there. I'd definalety give a shot at targeting the domain to a UK based site management group.