The local coffee shop near me got rid of its British staff over a matter of months because they were on contracts. They were replaced with Poles or similar because they were temps who could be called into work as needed.
Pret was one of my favourites until I heard their policy some months ago, I now try to avoid them but its getting difficult as it seems all restaurants and coffee shops have adopted the same policy.
I hate to hear the same reason about British workers, all cobblers, its about the money and employment regs.