13,000 British households have a black & white TV licence

"More than 13,000 households across the UK are still using black-and-white television sets, according to the TV Licensing authority.
London had the highest number of monochrome licences, at 2,715, followed by Birmingham and Manchester, it said.
The number of licences issued each year has dwindled from 212,000 in 2000. A total of 13,202 monochrome licences were in force at the start of 2013.
A black-and-white TV licence costs £49 a year, a colour licence costs £145.50.
TV Licensing spokesman Stephen Farmer said: "It's remarkable that with the digital switchover complete, 41% of UK households owning HDTVs and Britons leading the world in accessing TV content over the internet, more than 13,000 households still watch their favourite programmes on a black-and-white telly.""

Source:  BBC News, 10th January 2013

Note - Each household in the UK needs a TV licence if they have a TV.  You can only get a black and white licence if you only have a black and white TV.  If you have a colour TV and a black & white TV, you need a colour licence.