One clarification: the parties knew each other and talked before the pupil was 18. Although there was nothing sexual about the relationship before then, the two were certainly close. Does that change things at all?
Absolutely - the relationship being over down to a (admittedly rather too late) crisis of conscience I am trying to get a sense of the legal position.
One final follow, if I may, (before the top rating!).
Am I under a legal obligation to inform the school? I have already handed in my notice (as far as they are concerned for other reasons), but technically remain contracted until the end of August. Again, the right and moral thing to do is not necessarily the same as what is strictly legal - but it would be good to understand the full position.
Thank you very much for your help.