Thanks for all the encouraging posts and sorry I haven't replied sooner - I have been distracted with health issues with my younger son. My DH and I have the meeting on Thursday and I think that we are going to ask about the acceleration. Differentiation hasn't worked for us so far, so unless something changes it is not keeping DS challenged. From what we have been told he is advanced across all subjects so maybe acceleration will be the easier option. From a social point of view, DS6 doesn't have any close friends his age and although he gets on with the other children and is very kind to them etc he doesn't seem to have much in common with them and tends to find playtimes quite stressful. He has always preferred adult company, although him and DS4 play beautifully together all the time. I am hoping that maybe we can trial acceleration and see how that works out.
Thanks everyone for all the support, there is no-one DH and I can talk to about all this and I need to get myself prepared for Thursday's meeting.
XX