Thanks Penneyanne. I see I crossed with moosemama and she has already found you!
Worst issue for DS was when he caught the wrong bus home and I was very, very glad he had a mobile phone and knew how to use it. So don't leave giving him one until next Sept, get it earlier so that is isn't a novelty, less likely to be playing with it and getting it nicked. Not that DS actually phones or texts anyone but me!
Like coppertop's DS, mine hasn't made any friends, but he is quite happy with that. He finds group work tricky and is better in paired work with a suitably chosen partner.
I only know how he's set as the sets are numbered on his timetable. As I said, communication is minimal. He actually does quite well in CATs, but can't do sufficient writing or thoughtful analysis to get set any higher.
I have the SENCos email but I usually email one of the lead TAs who is very experienced (more so than the SENCo?) if there are any issues I need to discuss, but, TBH he's had a good year so I haven't felt the need to be on their case as I had to in primary school. The advantage of a bigger school is that they will have dealt with DC like your DS before and if you have a good school, they can be trusted to do things well.
He has found the rigid structure of the timetable and lack of unstructured time to suit him well! Lunch is only 45 mins and he spends most of it in the learning skills 'club.' If that wouldn't be suitable for your DS, try to find out what other clubs run, as they have Warhammer, Astronomy, Choir, all sorts going on that might suit at lunchtimes. Anything is better than them roaming around the school getting bullied. DS won't do any after school activities as home time is home time!
I still do all his homework with him, which is a bit of a pain, but he needs lots of support despite being of above average IQ. Sometimes I type as he talks or he writes or types as I dictate. I put a note on the h/w saying he was supported. He needed lots of support with revision at the end of last year.
I've talked before about the pupil passport they have. It's a summary of his main issues which comes up automatically on the teacher's laptop when they take the lesson register, (which they do for each lesson in his school.) In a big school good communication between the SEN dept and all the many teachers needs to be automatic, or at least, very well organised. Some teachers only teach DS for one lesson a week, so by the time they get to know him it would be Christmas!