A lot of Rap music for the UK audience is censored - and some are not even allowed in the UK.
For instance Cee-lo Green's single from a couple of years ago which goes on about "hoe's" was called in teh UK "Get You" whilst outside UK, and more-so in conservative US its called "F**k You"
There were three versions of the song in the UK - the original, unedited **** You, the music video edit Forget You, and the radio edit FU. The radio regulations of a country hardly reflect their sensibilities to music in general. I don't think your suggestion of the UK being a prudish country in terms of music is accurate in any way.
I don't know what the provenance of your claim of a Rammstein song being banned in the UK is, but I can't find any information on it.
The URL weatherfieldgazette.co.uk was featured in Coronation Street this evening but the domain name doesn't seem to be registered at the moment. They wouldn't be that careless would they?
Why do they need to be ? They'd be endlessly registering domains to do what with them exactly ?
It's more to stop other people doing anything with it. If they have a URL on screen and then a deeply disturbed individual registers it and hosts hardcore pornography, it might cause problems. Especially if there are lots of episodes featuring the URL already recorded.
None of the URLs you listed have been used on screen as far as I know.