Fourteen teenagers who all claimed to be aged between 14 and 17-years-old arrived at the UK Visas and Immigration head office in Croydon, south London.
Despite looking considerably older than the teenage cutoff point, the “children” are demanding asylum and saying they come from war-torn countries.
While the refugees may look to some like fully-grown adults, it is difficult to find documents or proof of age.
However, the Home Office is insisting that stringent security and age checks have been carried out.
Under EU regulations, most refugees must claim asylum in the first safe country they reach.
These teenagers are the first wave of a 100 child migrants expected to arrive before the Jungle camp is demolished.
A Home Office spokesman said: “This is the start of the process to transfer as many eligible children as possible before the start of the clearance, as the Home Secretary set out in Parliament.”
One man waiting to meet his long-lost brother was chef Asif Khan, from Afghanistan.
He said: “I really appreciate this. My brother was in Calais for the last six months.”
Former MP Lord Dubs brought in a new law to allow refugees without relatives to come here.
The Labour peer, who was rescued from Nazi Germany as a child, said: “Citizens UK’s Safe Passage team will be working round the clock to ensure that all children with a legal right to sanctuary in the UK are brought to safety.
“We must never allow a repeat of Calais.”