Presumably they have some theory about how they are going to stop people from taking the Eurostar to Paris then flying from Charles De Gaulles, either going through the passenger manifests or checking people's passports on the way back into the country. No doubt some countries will, in the manner of Israel, offer not to stamp ones passport. Or maybe the immigration officers will see a business opportunity here.
Anyway, someone should explain to Dave that a bait and switch only works if you wait for people to take the bait before you perform the switch. The Labour manifesto of '83 was described as the longest suicide note in British political history. This, I think, will go down in history as the shortest. Where do I bet on Hague being Conservative leader at the next general election?
(*) what is the opposite of biting satire, gumming satire?