You need to be cutting off his options to misbehave. No pocket money whatsoever, if he needs a new pair of trainers or deserves a treat etc then buy him the items, don’t give him any cash. Get him a very basic phone (not smartphone), or put settings on his smartphone so he has no internet use, also if possible set it to block all incoming calls except from family numbers, also block outgoing calls apart from these numbers.
a lot of the problem here is the friends he has. He’s travelling to other cities, so is he using cash/card to pay for bus/train fares? That’s what he should have NO ACCESS at all to cash, and also NO WAY to keep in contact with these unsuitable friends he goes drinking with. Leave him with the Xbox but change your WiFi password so he has no internet on it (games consoles have facility to send messages).
If you cut off the cash and cut off the way to make arrangements with these friends in other cities…his ability to behave in this way will be severely limited.
you’ve said he’s stolen alcohol from your house, so remove all the alcohol, or only buy it on the day you will drink it and keep it safely away from him. Ensure as well that you keep cash/cards in a ‘safe’ box as stealing money is the obvious thing he will try next.
as for the school…he’s better off in private becuase they have a higher ratio of staff to pupils so can give him more support…but I would want to keep him there…but if he’s expelled, I would just concentrate on getting him a place quickly, as being out of school for even a few weeks could make matters worse and you could find he ends up school refusing . If the state system gives him a place quickly, then put him there. It may actually be a solution anyway as being away from the ‘posh crowd’ and lads that he feels are more like himself could mean he finds a group of friends at school who are more suitable.
as for the holiday. I would go, because if you stay home for the week and he has nothing to do…aren’t you just going to be dealing with the stress of him possibly disappearing off to another city and drinking with his mates? On holiday (assuming you are a decent distance from home), he can’t do that. It’s also a chance to have a proper conversation with him without distractions (especially if you take his phone and any other device he could communicate with).
As for the £150 a month pocket money, I presume you are quite a high earning household and that’s normal and worked well for you elder children, but it’s not a good idea for a child who is out of control. If he can’t even do the basics such as be in bed at night and not out drinking…then you as a parent should not be rewarding him. As a parent you are responsible for providing clothes, food and a bed to sleep in…that is where your financial responsibility ends. You do not need to provide him with any ‘treats’ when he’s using that as a way to misbehave. It’s worse than misbehaviour becuase what he’s doing is putting himself in a lot of physical danger as well. You really need to put your foot down hard. I wouldn’t even buy him Nike trainers or branded clothes etc, because there is a risk he will sell things to his friends to raise cash if he doesn’t get his drinking money from you. Kit him out in ASDA clothes etc, things that don’t have a ‘street value’.
also a positive about state schools is that their pastoral team will have a lot more experience with dealing with this type of extreme behaviour (although they may have less time to spend having meetings with you than in private).
what you describe is so bad, in terms of not even knowing where he is and tracking him down and finding him drunk…is very shocking for 13. It’s normal at that age to experiment a little bit with alcohol with friends, but sneakily at a school friend’s house etc, not like this, what you describe is dangerous. I even think you should be considering calling social services and telling them your concerns as you clearly aren’t coping with him, a discussion with a social worker may be something that could scare him into realising how abnormal this is and how serious it is and that he may not even be able to continue living with you if his behaviour is so out of control that you cannot as his parents keep him safe. if you know where he is an he’s drunk, even calling the police to have him brought home may shock him, as they will actually sometimes be willing to support parents when a child is out of control.
How old are the friends he meets up with? Another concern would be if they are older than him? I do also think he could be a prime candidate for county lines, so breaking up these friendships really needs to be your priority, because if this escalates to drugs/crime then you could actually put his safety at risk by keeping him at home if he has errand/favours or owes money to someone dangerous.