The monarch will be ordered by the Government to avoid talk of reparations for the detention and mistreatment of thousands of Kenyans by the colonial administration between 1952 and 1960.

It will be the first major royal visit to Kenya since Britain in 2013 expressed “regret” for human rights abuses ­during the Mau Mau uprising.

It settled a High Court case, agreeing to pay £19.9million in damages and legal costs to 5,228 elderly victims of torture and repression.

But campaigners want compensation for land seizures and human rights abuses going back to the start of the colonial period in 1901.

Writing in The Observer, Caroline Elkins, a Harvard professor who wrote the book Imperial Reckoning: The Untold Story of Britain’s Gulag in Kenya, said the King must apologise.

She added: “It will probably trigger all sorts of liability issues but at last count, the monarchy is worth over £20billion, so you could give several quid.”

Some observers think the King will echo his comments about slavery on trips to Rwanda, Barbados and Ghana by expressing “personal sorrow”.

Kenya’s Human Rights Commission said 90,000 Kenyans were executed, tortured or maimed in the British administration’s fight with the anti-colonialist Mau Mau.