Hawzah News Agency-More than 200 doctors sent the letter to Dr Liam Fox, secretary of state for international trade.

They are all Medact, which was formed in 1992 and campaigns on health issues related to war and poverty.

Its letter said that war crime leveled at a Saudi-led coalition at war in Yemen have included attacks on three Médecins Sans Frontières hospitals which killed patients and medical staff.

The most recent incident involving the coalition happened last week when more than 140 mourners were killed in Sanaa after a funeral was bombed.

Human Rights Watch investigated the attack and said it was an “apparent war crime”.

Medcat’s letter said: “As health professionals, we have a duty to speak out against all causes of ill health in Yemen. This must include the sale and export of UK weaponry that is fuelling the conflict.”

Signatories to the letter include Eliot Waterhouse, a junior doctor who trained in Glasgow before working at Dumfries & Galloway Royal Infirmary.

He said: “The main point of the mass signed letter is a direct appeal to Liam Fox’s principles as a doctor, a job in which he practiced for a number of years.

“These attacks have destroyed the country’s infrastructure, leading to starvation and disease, prolonging the suffering of these already destitute people.”

Retired respiratory physician Duncan Macintyre added: “The UK government bemoans the results and offers increased ‘humanitarian aid’ but is not prepared to recognize its role in worsening the situation by provision of weaponry to the Saudis, including apparently an accelerated delivery of Pathway bombs from Glenrothes.”