aw, thanks, roisin!
It was OK actually - head is quite human & has a sense of humour which always helps; is perfectly well aware that members of staff are called names and stressed that they don't want to hear them. (Told that he should have waited until he got further away DS2 said "I was at the end of the corridor!" & head commented that sound carries in that corridor - ie he should have allowed for that!)
We both stressed to him that he needs to be always aware that anything he says or does at school may well be observed/overheard/reported.
The report from members of staff was glowing, which was nice - the actual offence sounds to come from a different boy - just (yet another) moment of madness really
I didn't put in janeite's suggestion in the end, not once the head had mentioned that the deputy may well be head of 6th form by the time DS2 gets there (the various deputy heads rotate responsibilities) - he's just got to a) not need to be hauled up in front of him again & b) think respectful thoughts in any future encounter.
That's if he gets there of course - any more offences highly likely to lead them to refuse to admit him (which would be both sad & frustrating because 6th form is 2 minutes away, nearest 6th form college 12 miles...)
I left him waiting outside deputy's office to make his sincere & heartfelt apologies. He has recently, unprompted, started shaking people's hands in formal situations so I'm wondering if he'll have managed that today &, if so, how deputy would take it