Damien

It might just encourage France to be even less bothered about securing the coastline or the Eurotunnel. We also need cooperation from France on all sorts of issues other than immigration. Souring relations with your direct neighbours is rarely productive.

I don't see how you solve this unless you make it harder for them to enter France in the first place. Let's face it, what incentive is there for France to make it hard to leave France for Britain? If it were the other way around, the British Government wouldn't exactly be popular for helping France but keeping prospective immigrants on our shores instead of theirs.

I think we should look at legal routes and find further ways to discourage illegal crossings. Introduce ID cards as well.