"Punished for inappropriate behaviour before... ?? But to him to two actions may appear poles apart. Asking someone to add them on social media. Asking someone to look at their belly. 2 entirely different actions." With the SAME teacher - he's not stupid he knows he's out of line!
"Besides, if the OP actually took this as a serious red light, she'd go and arrange a meeting with the school to find out if there were any minor incidents leading up to the expulsion incident for a fuller picture of the context." Instead she keeps looking to blame ANYONE else BUT her son!
"Give it to the summer and she will e back, name changed, bemoaning the fact her son can’t do his GCSEs because he has been permanently excluded." Yep wouldn't surprise me.
FUCKING HELL! You're STILL MINIMISING LOADS!!!
He's SENDING nudes - is there ANY chance that these are of under 18's? Because if so that is possession & distribution of indecent images of CHILDREN and that CAN get him on the SOR.
You keep banging on HE is "just a child" well they're someone's daughters! If one of their parents discover this they are perfectly within their rights (legally & morally) to report him to police - I would! How's a conviction like that going to affect his future?
I believe (certainly true where I live) schools tell pupils this law and educate/advise them on sm use. Certainly dd and her friends were well aware from talks given and the issues being incorporated into certain subjects on Internet safety and laws.
And NO not "everyone" does this, certainly not at that age!
Tell the school. Get him a basic phone that texts & calls only he's clearly too immature & irresponsible to handle a smart phone THAT is what you do MINIMUM!
"Do most parents of year 11s look through all their children's phones and social media daily?" Maybe not daily but regularly like 2-3 times a week? Yes!!!
"But a couple of nudes, pics of his abs etc. No dick pics." Have you looked through ALL the apps? Inc ones he's deleted? (If you check his iTunes account it'll show which apps he's had now or in past) some look like they're other things precisely to hide things from parents, there's "discreet" photo storage apps etc. You need to educate yourself on child Internet safety ASAP.
http://www.carolinaparent.com/CP/Secret-Apps-Your-Teen-May-Be-Using-to-Hide-Photos-Videos-Messages-and-Files/
https://www.quickanddirtytips.com/tech/mobile/are-your-kids-using-secret-apps-to-hide-their-stuff
Google "ghost apps" "child online safety tips" etc. His schools safeguarding officer may be able to advise too.
His feelings for her are irrelevant, how she feels in his presence (which putting it mildly is irritated, more likely unsafe) IS relevant. Your husbands attitude is shit and also needs addressing.
That he thinks his being attracted to her ENTITLES him to behave at best inappropriately at worst threateningly you REALLY need to address. It's the basic underlying problem with stalkers & worse predators. They think it's only their feelings that count, they don't actually care about their victims feelings.
"Well done for addressing it with him OP." But she hasn't! She's basically gave him a cuddle and said mummy will make it all go away!!
"I very much doubt your DH would be laughing about it if a 15 year old had nude pictures of your DD would he." Definitely! But it's fine and "boys will be boys" "he's a bit of a lad" when it's his son having such pics I suspect.
"I'm assuming that you at least keep an eye on his siblings Internet use?" I highly doubt it given the incredulous responses to monitoring her sons online activity!
The utterly lax parenting is shocking! I understand those questioning the veracity, sadly as someone who's worked in a voluntary capacity with teens and has a fair number of family and friends who are teachers I'm all too aware that there are some appallingly passive & complacent parents out there.
If he were my son:
Phone, Xbox & gym would be gone! Indefinitely until he can prove he has the maturity and responsibility to deserve them and be able to use them appropriately.
Grounded for a month.
Set to researching the effects on victims of harassment, having their indecent photos distributed/commented on.
Revision for exams his primary occupation when home.
And I'd be alerting the school to the issue with the photographs. This could possibly result in permanent exclusion and if so tough! The protection of those girls is more important.