Opposition to Saudi Arabian Crown Prince Mohammed bin Salman’s visit to the UK are based on a “misunderstanding” of the war in Yemen, the Saudi foreign minister has claimed, as protest groups ready for three days of planned demonstrations.

The powerful heir to the throne arrives in London on Wednesday for three days of talks with Prime Minister Theresa May, Foreign Secretary Boris Johnson and the royal family.

Government officials have stressed Saudi Arabia is a key ally in the global fight against terrorism as well as a key trading partner. In the wake of Brexit it is hoped Riyadh will pick London for the planned floatation of state oil company Aramco, which could be as high as $1.5tn (£1.1tn).

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British exports to the country have risen 41 per cent to £6.2bn since 2010 - the majority of which are arms sales. Rights groups say the weapons are destined for use in Yemen, where Saudi Arabia is leading a stalemated effort against Iran-backed Houthi rebels to restore the exiled government.

But the prince is a controversial figure: he is widely acknowledged to have spearheaded the kingdom’s intervention in the Yemeni conflict, sparking a humanitarian disaster. His critics claim rapid social and economic reforms introduced since he was appointed heir to the throne last June are “cosmetic changes” designed to distract from the Kingdom’s still dismal human rights record.

Speaking to BBC Radio 4’s 'Today' programme on Tuesday, Foreign Minister Adel al-Jubeir insisted that the Saudi presence in Yemen was justified.

“I believe [opposition group’s] positions are based on misunderstanding and not knowing.

“They criticise us for a war in Yemen that we did not want, that was imposed on us.

“They criticise us for a war in Yemen that is a just war, that is supported by international law.

“They criticise us for the casualties in Yemen when it was imposed on us by the Houthis.

“They should be demonstrating against the Houthis for taking nine-year-old boys into battle, they should be protesting against the Houthis for laying siege on towns and villages and starving people, for stealing humanitarian assistance.”

The situation in Yemen Show all 14 1 /14 The situation in Yemen The situation in Yemen Houthi supporters trample on a US flag during a gathering mobilizing more fighters into several Yemeni battlefronts, in Sana'a, Yemen EPA The situation in Yemen People carry the coffins of men, who were killed in the recent Saudi-led airstrikes during their funeral, in the Old City of Sanaa, Yemen AP The situation in Yemen Pro-government fighters give food to Yemeni children on the road leading to the southwestern port city of Mokha. Yemeni rebels are putting up fierce resistance in a key Red Sea port city where they are encircled by pro-government force Getty Images The situation in Yemen A Yemeni stands in front of a graffiti protesting US military operations in war-affected Yemen, in Sana'a, Yemen. According to reports, US Special Forces troops allegedly disembarked from US helicopters in the Yemeni town of Yakla and attacked several houses belonging to members of the terrorist group Al-Qaeda, killing three high-ranking Al-Qaeda members and nine civilians, six women and three children. One American serviceman has been killed and three injured in the attack EPA The situation in Yemen US Special Forces troops allegedly disembarked from US helicopters in the Yemeni town of Yakla and attacked several houses belonging to members of the terrorist group Al-Qaeda, killing three high-ranking Al-Qaeda members and nine civilians, six women and three children. One American serviceman has been killed and three injured in the attack EPA The situation in Yemen A Yemeni female fighter supporting the Shiite Huthi rebels, and carrying weapons used for ceremonial purposes, takes part in an anti-Saudi rally in the capital Sanaa Getty Images The situation in Yemen Yemeni female fighters supporting the Shiite Huthi rebels, and carrying weapons used for ceremonial purposes, take part in an anti-Saudi rally in the capital Sanaa Getty Images The situation in Yemen A boy shouts slogans next to pro-Houthi fighters, who have been injured during recent fighting, during a rally held to honour those injured or maimed while fighting in Houthi ranks in Sanaa, Yemen Reuters The situation in Yemen Balls of fire and smoke rise from a Houthi-held military camp following alleged Saudi-led airstrikes, in Sana'a, Yemen EPA The situation in Yemen Yemenis search under the rubble of damaged houses following reported Saudi-led coalition air strikes on the outskirts of the Yemeni capital Sanaa Getty Images The situation in Yemen A Yemeni boy looks on as Yemenis search under the rubble of damaged houses following reported Saudi-led coalition air strikes on the outskirts of the Yemeni capital Sanaa Getty The situation in Yemen A Yemeni boy sits amidst the rubble of damaged houses following reported Saudi-led coalition air strikes on the outskirts of the Yemeni capital Sanaa AFP/Getty The situation in Yemen Marine One with US President Donald Trump flies with a decoy and support helicopters to Dover Air Force Base in Dover, Delaware, for the dignified transfer of Navy Seal Chief Petty Officer William 'Ryan' Owens who was killed in Yemen Getty Images The situation in Yemen US President Donald Trump aboard the Marine One to greet the remains of a US military commando killed during a raid on the al Qaeda militant group in southern Yemen on Sunday, at Dover Air Force Base, Delaware, US Reuters

“The overwhelming majority of people in the UK do not share Theresa May’s political and military support for the Saudi regime,” Andrew Smith of Campaign Against the Arms Trade (CAAT) said in a statement.

“Despite the spin surrounding the Crown Prince, he is a figurehead for one of the world's most authoritarian dictatorships.

"The regime has carried out atrocities against Saudi people for decades, and has inflicted a terrible humanitarian catastrophe on the people of Yemen. It is time for Theresa May and her colleagues to end their shameful support for this appalling autocracy.”

The crown prince himself said that strong relations between the two countries were important for global security in an interview with The Telegraph published on Tuesday - and that the Kingdom’s strategy to wean itself off dependence on oil, known as Vision 2030, represented opportunities for British business.

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“We believe that Saudi Arabia needs to be part of the global economy,” he said.

“People need to be able to move freely, and we need to apply the same standards as the rest of the world.”

Expected protests outside Downing Street would not affect the crown prince’s plans, Mr Jubeir said.

“This is part of your traditions, there are protests that take place in London all the time,” he said.