The British Health Secretary Matt Hancock has resigned after he admitted breaking Covid-19 guidance by kissing and embracing an aide in his office.

Mr Hancock's resignation letter was sent to Prime Minister Boris Johnson this evening.

In his letter, Matt Hancock said: "The last thing I would want is for my private life to distract attention from the single-minded focus that is leading us out of this crisis.

"I want to reiterate my apology for breaking the guidance, and apologise to my family and loved ones for putting them through this. I also need (to) be with my children at this time."

In a video posted on Twitter, Mr Hancock said: "I understand the enormous sacrifices that everybody in this country has made, you have made. And those of us who make these rules have got to stick by them and that's why I've got to resign."

In response, Prime Minister Johnson wrote: "You should leave office very proud of what you have achieved - not just in tackling the pandemic, but even before Covid-19 struck us."

This evening, Downing Street announced that former chancellor and home secretary Sajid Javid will replace Matt Hancock as Health Secretary.

We need your consent to load this rte-player contentWe use rte-player to manage extra content that can set cookies on your device and collect data about your activity. Please review their details and accept them to load the content.Manage Preferences

A video of Mr Hancock in an embrace with Gina Coladangelo was published last night, after stills from the CCTV clip earlier in the day prompted Labour to deem his position "hopelessly untenable".

Lawyers described how Mr Hancock may have broken the law regarding coronavirus restrictions, although he admitted only to breaching guidance.

There were also questions about Ms Coladangelo's appointment to her role in the Department of Health and Social Care (DHSC) in the first place.

The prime minister had resisted calls to sack Mr Hancock, who said he was "very sorry" for letting people down after The Sun first reported he was having an extramarital affair.

But the Daily Telegraph reported that Tory MPs were telling the prime minister to "pull the plug", with public reaction over coming days key to his fate.

A snap poll from Savanta ComRes, released hours after photographs of the pair kissing in Mr Hancock's ministerial office surfaced, found 58% of UK adults thought that Mr Hancock should resign, compared to 25% who thought he should not.

And the Covid-19 Bereaved Families For Justice group, which represents those who have lost loved ones to the pandemic, also called for Mr Hancock to go.

In a letter to the prime minister, the group said it had broken its "position of neutrality on ministerial conduct" to urge Mr Johnson to relieve Mr Hancock of his job.

Ms Coladangelo, who is married to the founder of the retailer Oliver Bonas, Oliver Tress, is a friend of Mr Hancock's from their days together at Oxford University and was appointed to the DHSC last year.

She was initially taken on as an unpaid adviser on a six-month contract in March 2020, before being appointed as a non-executive director at the department.

The Metropolitan Police said it was not investigating any offences, which allegedly took place last month, because "as a matter of course the MPS is not investigating Covid related issues retrospectively".

Human rights barrister Adam Wagner told BBC News: "I am pretty clear, although you never know for sure, that there was a breach of the regulations, on the basis that at the time it was illegal to have any gathering of more than one person anywhere indoors unless an exception applied.

"The only one that could reasonably be said to apply or possibly said to apply would be that this was reasonably necessary for work purposes.

"But based on what we know and what we can see in the images, it doesn't seem that that was reasonably necessary for work purposes."

Mr Hancock is also accused of breaking the ministerial code and in a letter to Mr Johnson, Labour deputy leader Angela Rayner said Christopher Geidt, the independent adviser on ministerial interests, should probe Mr Hancock's behaviour.

Labour Party chairwoman Anneliese Dodds said if Mr Hancock, who has been married to the mother of his three children, Martha, for 15 years, had been secretly having a relationship with an adviser he appointed to a taxpayer-funded role, it was "a blatant abuse of power and a clear conflict of interest".

A No 10 spokesman insisted the "correct procedure" had been followed in relation Ms Coladangelo's appointment but refused to go into detail.

Professor Stephen Reicher, a government behavioural science adviser on the Spi-B committee, said the Prime Minister sticking by aides and ministers who may have breached the rules made the repercussions for restriction compliance "toxic".