Reach plc operates 240 local and regional newspapers in the United Kingdom as well as the national newspapers Daily Mirror, Sunday Mirror and The People, purchased Northern & Shell in 2018, thus adding the Daily Express and Daily Star to its stable.[37][38] In 2018 TheGuardian.com, News UK (The Times, The Sunday Times, The Sun) and The Daily Telegraph created a joint platform for advertisers to buy online adverts across the multiple leading news websites, called The Ozone Project.[39] Later in the year Reach plc joined the platform, bringing nearly all of UK's national newspapers onto the platform.[40] As of 2020, the newspaper with the highest circulation is the Metro with 1,426,535 readers.[41] The Sun and other tabloid daily newspapers have seen a drop in circulation.[41]