Righto Kirsty in that case, it could well be the higher BG that's causing the itch. So - back to the nurse - you need training to carb count and dose adjust like ASAP please.
I hadn't realised at all he was spending so much time so high - though in some ways I can see he might not actually be 'typical', because kids are often diagnosed quite soon after starting to display symptoms and often spend quite a long time in comparison to adults in their honeymoon phase, when comparatively teeny doses of injected insulin are sufficient - hence, they treat kids accordingly, ie not aggressively.
PS if he gets over the itching when you sort his BGs, and you find you miss it not him - you'd be welcome at my house to scratch mine any time!