But still for some reason, the uk.com subdomains (similar to us.com and operated by Centralnic too) are fairly popular in the UK.
Not nearly as much as .co.uk obviously, but there are still quite a large number of small businesses and even a few big ones in the UK which use these uk.com subdomains.
For example, Dominos Pizza UK :
their customer-orientated site is
http://www.dominos.co.uk
their institutional site for investor relations, franchising, etc is
http://www.dominos.uk.com