Hey, I've just realised that my policy to "stop the boats", sending someone to Calais to hand out ferry tickets, as well as being guaranteed to work with 100% effectiveness within hours of implementation, would also make a substantial contribution to the public purse:

If the refugees didn't have to give all their money to people smugglers they'd have it still available to live on once they arrived here, so would need that much less in benefits payments and other support.