Fabby I addressed the possibility of a tutor further up, ie he's had one before. All it teaches him is to rely on someone else, which at the age of 17 he should not need, and whilst we could afford one, getting one in all 3 subjects would be very expensive (at least £30 per hour, per week, per subject). Also, whilst he has our full support, it also teaches him that we will bail him out no matter what. And in most cases we will. And if he found the subject matter hard we would consider it, but it's lack of motivation that is the issue, and now as others have said he's in a catch-22. Low grades -> dwindling motivation -> lower grades -> dwindling motivation.
Super we spoke to all three teachers and his lead tutor in the Autumn as requested. I imagine they half thought it was settling in issues and gave him the benefit of the doubt. Same lead tutor asked to see him late January. They had a meeting. (I spoke to the lead tutor before the meeting to give him some background re DS as I think they think he's not very smart: example - when we sat down with the maths tutor 6 weeks in she looked at him and said she didn't understand why he had chosen maths off the back of his lack of homework and a recent test score of 18%. He pulled his socks up and just 3 weeks later got 50 something % in another test. They don't know DS like they did at secondary school, so I filled the lead in a bit). He had some learning support and got organised: sorted his papers and created a timetable to include his lifting and chill time etc.
He did have a shit start. He split up with his first gf about 3 weeks in. They'd only been dating for 2 months, but he had been in love with her for 3 years. It was his decision to split but it troubled him greatly.
Anyway, we are seeing the three tutors and lead tutor next Tuesday. I will make sure we ask what the options are if he doesn't improve and also what the requirements are, if any, for Y13.
Yesterday DH and I helped him go through the syllabus on the intranet and we pulled out everything he needed to cover for all three subjects and put it in a spreadsheet so that he can organise his study time. He's redone his timetable. We've postponed his driving lessons as they were 2 hours once a week: we can get back to that further down the line.
I am hoping that now he knows what he doesn't know/has rejigged his timetable he can knuckle down. No gaming until after 8pm. Bed at 10.30pm (not a problem for him). One whole day off a weekend. Seems doable. Just needs to stick with it.
I really appreciate all the tips and advice here, and I feel for anyone else going through the same. Thank you.