You only have to cross the Channel and it would have been totally legal.
(Unless, as I commented earlier, he was teaching the girl at the time).
What this all boils down to, of course, is that after the Soham murders there have been this heinous calls for accusations against someone being taken as reason to bar them from certain jobs. ACCUSATIONS.
Such hysteria from the public and media causes this. I will be sick to my stomach if unproven allegations are ever used as a basis to do anyhting at all to someone.