The Telegraph is reporting that Sunak and a majority of the cabinet are in favour of reducing isolation to five days (they are more or less on the money when they lead with things like this). It makes sense to me as people with Omicron are most transmissible in the two days before they know they have it and the two days after they know. As cases as so high anyway it doesn't matter if a very small proportion could still give it to others after five days.
Majority of the Cabinet are said to favour the move as a solution to rising staffing shortages across NHS and industry
www.telegraph.co.uk