Poland and the United Kingdom have concluded a treaty on partnership in security and defence. What, specifically, does the document cover? On Wednesday, 27th May, in London, the Prime Ministers of Poland and the United Kingdom signed a treaty on partnership in security and defence. The place chosen for the signing was no coincidence. It was Uxbridge in London, where, during the Second World War, the command of No. 11 Group RAF was located, the unit that issued orders to the Polish pilots of No.