The Welsh Government says UK Government plans to stop free testing are "premature and reckless".
The Prime Minister is due to speak to the Commons this afternoon and then take part in a press conference tonight. It is widely reported he will say there will soon be no legal requirement for people to self-isolate if they test positive for Covid, but urge them to do so.
It is also expected he will cut access to testing. Community PCR testing for people with symptoms is expected to stop under the new plan, but it is unclear whether the availability of free lateral flow tests will be reduced. On Sunday, Mr Johnson told the BBC's Sunday Morning programme the UK spent £2 billion on testing in January alone and that such high expenditure did not need to continue.