Britain's health minister Sajid Javid has said he had tested positive for Covid-19, but that his symptoms were mild and he has had two doses of vaccine against the disease.

In a video on Twitter, he said: "I was feeling a bit groggy last night, so I took a lateral flow test this morning and it's come out positive, so I'm now self-isolating at home with my family until I get the results of a PCR test.

"I'm grateful that I've had two jabs of the vaccine and so far my symptoms are very mild."

The Health Secretary's announcement comes as the UK government prepares to go ahead with the final lifting of lockdown restrictions in England on Monday, despite the misgivings of some scientists.

Mr Javid is now required to self-isolate for ten days unless the PCR test comes back negative and he no longer has symptoms.

Any of his "close contacts" - potentially including others in the government - would have to self-isolate too if they receive instructions from the NHS.

Mr Javid has only been in the job since 26 June, when former health secretary Matt Hancock resigned following revelations he had broken coronavirus restrictions.

Mr Javid said any member of the public feeling symptoms should get a test too.

"If everyone plays their part, you're not only protecting yourself and your loved ones, but you're also safeguarding the NHS and helping to preserve our way of life," he said.

However, with coronavirus cases again surging, many scientists say the government is endangering the NHS with its plan on Monday to scrap most legal pandemic requirements in England.

For the first time since mid-January, Britain's daily Covid caseload exceeded 50,000 yesterday, and Mr Javid has warned the figure could double from that in the coming weeks.

But the government insists that with two-thirds of the adult population now fully vaccinated, the risk can be managed, and Monday has been dubbed "freedom day" by many UK media.

The UK reported 54,674 new cases of Covid-19 today, up from 51,870 yesterday. Another 41 coronavirus deaths were reported, there were 49 deaths yesterday.

London Tube line suspended after staff told to self-isolate

A London Tube line has been suspended due to a staff shortage triggered by workers told to self-isolate by the NHS Covid-19 app.

The Metropolitan Line was not running due to control room staff being alerted by the app in the morning.

Services on the Piccadilly and District line were also affected, and are not expected to resume until 9pm.

The suspension comes after warnings to the government over a "surge" in workers and medics being forced into self-isolation over coronavirus contacts from Monday.

Transport unions have said there will be "dire consequences" next week when staff are "pinged" as the level of infections rise.

Rail, Maritime and Transport union (RMT) general secretary Mick Lynch previously warned that Monday "will see a surge in workers pinged with a self-isolation instruction next week".

"Even at this late stage, the government, the train operators and the bus companies should issue a clear, legally backed instruction that levels up the rest of the UK to the safety standards that will remain in force in Wales and Scotland," he said.

Elsewhere in the country, passengers were warned of alterations on some Northern routes this weekend due to a number of front-line staff either testing positive for Covid-19 or having to self-isolate.

According to the National Rail Enquiries website, trains may be cancelled in both directions on services connecting Huddersfield, Sheffield and Lincoln, Sheffield with Leeds, Retford and York and between Leeds and Doncaster.