Refugee groups have condemned plans for a £1.9m ‘Great Wall of Calais’ - to prevent migrants boarding lorries to cross the Channel to Britain - as cruel and dangerous.

The Government came under fire after revealing that a four-metre-high, one-kilometre-long wall would be part of the latest attempts to strengthen security, as the crisis at the French port grows.

Work is to start this month, along an approach road, to thwart migrants who have used rocks, shopping trolleys and tree trunks to try to stop vehicles – allowing them to climb aboard and reach Britain.

Doctors of the World, which provides care to refugees in Calais, called the spending of taxpayers’ money on the wall “as outrageous as it is ludicrous”.

Leigh Daynes, its executive director, said: “Bridges, not walls, are the answer to the humanitarian catastrophe in Calais.

“Walls do more than repel. They exacerbate the already fragile mental health of traumatised people. They are as cruel as they are meaningless in the face of a global refugee crisis that knows no boundaries.”

The criticism was echoed by Help Refugees, which says it is the largest provider of aid in Calais. It said the money should be spent on the people in The Jungle refugee camp. Lliana Bird, its co-founder, said: “Nearly 10,000 people, including nearly 1,000 children have simply been left to languish. As history has repeatedly shown us, building walls is never the solution.”

Migrants leaving the northern area of The Jungle migrant camp today (Reuters)

And Steve Symonds, Amnesty International UK’s refugee expert, said: “This plan is yet another example of European governments’ failure of leadership on the refugee crisis and their shocking inability to come up with a humane response.

“A wall will simply further empower smugglers by forcing people to take even greater risks to get across the Channel.”

The plan was revealed by the immigration minister, Robert Goodwill, who said it was part of a £17m package of joint Anglo-French security measures.

He told a committee of MPs: “People are still getting through. We have done the fences, now we are doing the wall.

“We are going to start building this big, new wall as part of the £17m package we are doing with the French. There is still more to do. We have also invested in space for 200 lorries at Calais so that they have somewhere safe to wait.”

It is expected to be made of smooth concrete, in an attempt to make it more difficult to scale, with plants and flowers on one side to make it less ugly, and be completed by the end of the year.

The Road Haulage Association has also said it will be a poor use of taxpayers' money, arguing that security levels need to be improved on the surrounding approach roads to Calais.

Both the SNP and Green MP Caroline Lucas likened the idea to Donald Trump’s much-criticised - and much-ridiculed - plans to force Mexico to build a wall to keep its migrants out of the United States.

Calais and Dunkirk camps Show all 16 1 /16 Calais and Dunkirk camps Calais and Dunkirk camps (Photo: Alan Schaller) Calais and Dunkirk camps A portrait of an Afghan man wearing a traditional Perhan Turban in the Calais Jungle (Photo: Emily Garthwaite) Calais and Dunkirk camps Two Gendarmes guard the main entrance to the Dunkirk camp (Photo: Emily Garthwaite) Calais and Dunkirk camps One Kurdish Iraqi man’s reminder to himself (Photo: Alan Schaller) Calais and Dunkirk camps Two young boys in the Dunkirk camp (Photo: Alan Schaller) Calais and Dunkirk camps An Iranian hunger striker stands outside the only remaining shelter in the South Side of the Calais camp (Photo: Emily Garthwaite) Calais and Dunkirk camps A church in the South Calais camp, on of the the only structures not demolished in the South Side of the camp (Photo: Emily Garthwaite) Calais and Dunkirk camps A man gets a hair cut in the Calais camp (Photo: Alan Schaller) Calais and Dunkirk camps Night falls on the Calais Jungle. Fires burn in the distance (Photo: Alan Schaller) Calais and Dunkirk camps The containers provided as alternative accommodation for the people in the camps (Photo: Alan Schaller) Calais and Dunkirk camps A young boy in the Dunkirk camp (Photo: Alan Schaller) Calais and Dunkirk camps A man listens to music inside one of the shipping containers (Photo: Emily Garthwaite) Calais and Dunkirk camps The awful living conditions in the Dunkirk camp (Photo: Alan Schaller) Calais and Dunkirk camps An Afghan man in the Calais camp (Photo: Emily Garthwaite) Calais and Dunkirk camps One of the Iranian hunger strikers (Photo: Alan Schaller) Calais and Dunkirk camps A family in their wooden shelter in the new Dunkirk camp (Photo: Alan Schaller)