How do you believe immigration policies should be reformed to best benefit a country's economy and society?

Very simple, for anyone immigrating there should be a strict system that checks to see if that person is a criminal, has committed a crime in their home country, if they are a criminal. No citizenship.

Furthermore, if the person doesn't know part of the language, they can't be let in. Turn back all the boats, if they come from France they aren't fleeing, secondly immigrants for a few years should have to pay for the NHS. Cheap foreign workers shouldn't be flown in for work, only skilled immigrants that can provide to society can be let in.