Or will he be having to live in Poland for sometime before being able to move to London?
Better check that he will be able to live in Poland too......he'll need a visa to stay there for any length of time, I would assume.....same as the UK. Also it would be interesting to know why he was turned away, once he had arrived. I guess in the UK, like in the USA, just because you have a Visa, it does not guarantee entry into the country (which is sth I just don't understand).