If you've had a bad experience with "someBadSite.co.uk" then downscore ""someBadSite.co.uk" NOT "co.uk" which is not a site in its own right..
The CO.UK "suffix" is used by most major companies and organisations (good & bad) operating in the UK and there are over 9 MILLION domains names licensed under it e.g. bbc.co.uk (the BBC), Amazon.co.uk (for those buying from Amazon in the UK), Microsoft.co.uk etc. etc. etc.