King Charles is due to be whisked away to Sandringham in a helicopter – moments after Prince Harry arrived in London. The monarch is due to leave London less than 24 hours after revealing he has been diagnosed with cancer.

The King is undergoing treatment for the condition but aides have refused to disclose at what hospital he is receiving out-patient care.

Charles has already commenced “a schedule of regular treatments” to battle cancer under the supervision of his specialist team of doctors, having returned to London on Monday from Sandringham.

The King is said to be “wholly positive about his treatment” and grateful that medics caught it early.

Having told those nearest and dearest to him about his condition, King Charles may be expecting more family members to pay him a visit.

Earlier today on February 6, Princess Beatrice and her husband Edoardo Mapelli Mozzi were pictured leaving King Charles’s London home at Clarence House.

Prince Harry also touched down in the UK at midday, after he was seen at a private terminal in LAX airport this morning – there is ongoing speculation where the Prince will reside during his visit.

Prince Harry‘s visit comes as a royal expert claims he is worried for the King. Royal author Angela Levin suggested Harry has some “warm feelings deep down” for his father and is “deeply concerned” about his welfare.

The Palace’s official statement said that King Charles had been diagnosed with a form of cancer – but they refused to go into the specifics. However, aides clarified that it is not prostate cancer.

The cancer was identified while the King was receiving treatment for his prostate last month. He was admitted to a private hospital on Friday January 26 and stayed in for three nights.

Last night’s news, released by Buckingham Palace, was accompanied by a new picture of the King and sparked speculation about the monarch’s health and the wider ramifications for the British monarchy.

King Charles is insisting on working through his treatment, although he has cancelled all forward-facing public engagements to minimise any possible health risks. This comes as other members of the Royal Family prepare to step up for duty.

But he will continue to undertake his weekly meetings with the Prime Minister and will go through his government Red Box every day. The King is also looking at ways to commit to regular Privy Council meetings – the formal body of advisers to the monarch.

Meanwhile Rishi Sunak opened Tuesday’s Cabinet meeting by paying tribute to the King and wishing him a speedy recovery.

His official spokesman said: “The Prime Minister opened Cabinet by paying tribute to the King and said all of our thoughts would be with His Majesty and we wish him a speedy recovery.”