Getty The Blues and Royals regiment on their way back from Somme celebrations in France

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The stowaways managed to avoid being spotted by members of the Blues and Royals unit by hiding inside the bus’s engine compartment. But when the coach pulled up at their barracks near the Queen’s residence of Windsor Castle, they were discovered. Soldiers quickly gave the trio, thought to be all men, first aid before handing them over to police.

No one knows where exactly the illegals got on the bus but it must have been somewhere in France Source

The troops made the shocking discovery on Thursday afternoon on returning from France where they had been marking the Somme centenary. An insider told The Sun: “No one knows where exactly the illegals got on the bus but it must have been somewhere in France. “The coach was searched by the soldiers but the stowaways found a place where you would not normally choose to look, inside the engine.

Getty The Blues and Royals regiment were on the bus near their Windsor barracks

“They were in a pretty bad state when they were found. “There was all sorts of commotion when the coach pulled up and they were spotted. “Once they were patched up they were turned over to the police.”

The Blues and Royal regiment is part of the Household Cavalry whose barracks are in Windsor, Berkshire, which they share with the Life Guards. An Army spokesman, said: “We are aware of this alleged incident. It is being investigated by the civilian police and it would be inappropriate to comment further.”

Getty Prince Harry was in the Blues and Royal regiment before leaving the Army last year

Getty The Queen on a visit to the Household Cavalry's barracks in Windsor

Britain’s Armed Force have not been involved with migrants much since the crisis in Europe exploded last year. However earlier this year the Army revealed it was investigating claims UK troops and their family members were being attacked by migrants in Germany.

Migrants go to extreme lengths to cross borders Fri, October 7, 2016 Desperate migrants fleeing Syria and surrounding places have been trying to sneak across borders in incredible ways. These include hiding in suitcases and sleeping next to car bonnets Play slideshow 1 of 40