After a year long market study, the CMA has concluded that Apple's browser engine ban on iOS in anti-competitive and distort the browser market, as well as limit the capabilities of web apps on iOS and on the entire mobile eco-system. They note that it is obviously to their own benefit, as a weaker web on iOS results in a stronger exclusive and captive native app eco-system, which they can tax at will.
The CMA is now set to start a market investigation reference (MIR) which will give them the power to impose changes to Apple. The number one remedy considered is requiring Apple to stop banning competing engines on iOS.
Announcement for the MIR: https://www.gov.uk/cma-cases/mobile-browsers-and-cloud-gamin...
Final market study report: https://www.gov.uk/cma-cases/mobile-ecosystems-market-study