.co.uk?

[twinkie2010]

Where do I buy .co.uk?

[DD-Mark]

you can buy .co.uk from alot of places, try namecheap.com

[ripps]

you can buy .co.uk with lots of registrars and the most famous ones according to me are :
godaddy, name, namecheap
if you can spend more bucks then you might even try enom

[Mybel]

Eurodns is the right domain registrar for that.
Their prices are not high on domain registration services and you may use discounts which к they unleash every month.