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There, he earned his GED diploma, learned bricklaying and carpentry, was introduced to boxing and visualized a real future.

For Sienna, it was a "lucky" experience to tackle bricklaying, joinery, plastering and now plumbing.

Then they are introduced to an array of different trades including bricklaying, carpentry, masonry, iron work and sheet metal work.

Tens of thousands of new recruits across bricklaying, groundworks and carpentry are needed to get anywhere near the target, they told the BBC.

Riley, Remus, Muhammad, all aged 17, and Heath, 16, met for the first time a year ago when they enrolled on a summer course in bricklaying.