postcode

But for now they pick very carefully where to open, using an algorithm to help select the most promising postcodes.

"We consider this to be a bit of a postcode lottery," she said.

Two of the three brothers who are directors of the group live in some of the most expensive postcodes in London.

She had only been sent a postcode and says she seemed to be walking into an industrial estate.

She added that variation between regions in terms of children's outcomes amounted to a "postcode lottery" for those who became involved with the youth justice system.