This is a key issue for the Tories - not that they are pandering to the right-wingers in any way, oh no. Introducing a formal quota makes immigration a political football forever and I think it is too important to be treated that way.
They plan an annual quota of 20,000 refugees for the UK. How is that supposed to work? So, when you are in fear of torture or a threat to your life from a repressive regime and you spend three weeks locked in a container on the deck of a cargo ship, you turn up at Southampton in December and the government will turn round and send you back, because you are the 20,001 person that year to claim asylum.