They drove to France in his car?
It would have just been a case of him passing two passports through the window to the passport control and her waving to the clerk from the passenger seat before he drives onto the ferry.
I think Bicks was thinking of the the alternative scenario with very much the same outcome. Border control aren't going to be bothered about two (happy looking) people in a car. Also, knowing French border control very well, they aren't going to give a rats arse about who comes through, just as long as they see two valid passports.
Also, but I don't know this, if they do a reg check on the car and see nothing wrong, what can they do? They've got 200 + cars behind them and quick Pernod and croissant to look forward to [/casual racism] .