[dfawcus]

There are no international water in the short straits between England and France.

To send a ship back we'd have to escort it, then the French would forcefully object to our actions.

Basically for us to send ships back, or send people back, without French cooperation amounts to an act of war. We'd have to use our armed forces, with the obvious reaction from the French armed forces.

Not really a practical, nor sensible proposition.