Viewing figures are BS.
The BARB reporting panel is 5,100 homes. The panel homes are located across the UK and represent the viewing of all individuals aged 4 and over within the household (plus their guests) and return data on a daily basis from around 11,300 people. All digital terrestrial, satellite and cable platforms are represented, along with their analogue counterparts.
So they estimate how many people are watching a TV show from what these 11,300 people are watching. There are over 61 million people in the UK and they say 600,000 watched it, that's around 1%. They got the number 600,000 because 1% (113) out of 11,300 people watched it.