Nine official sectors.
Computing is the biggest sector according to http://www.bbc.co.uk/news/entertainment-arts-25742231
There are 1, 684, 000 jobs in creative industries according to this source, and the details of the revenue made was “IT services led the field with exports totalling £7.2bn. Film and TV came in second with £4.2m, while the music industry made £275m.” The site also said it was “worth £71.4bn a year”.
another source – https://www.gov.uk/government/news/creative-industries-worth-8million-an-hour-to-uk-economy says the industry is worth 8 million per /hour/. 5.6 per cent of UK jobs are in creative industries according to this source. worth £71.4 billion per year to the UK economy.