Thought I'd mention this even though I'm not sure about it yet! I'm busy buying some Kinesio Tape for ds from amazon for his hypermobility. He was given it by OT because of his hands hurting when writing at school - it's had good results, I'm amazed! Anyway, there's a note at the end of the write up from amazon which says Did you know? Amazon can issue VAT refunds on eligible sales to customers who are registered disabled or chronically ill. I've had a quick look on HMRC website and I think we should be able to claim the VAT back on some products but I'm not entirely sure.
Just thought is was worth a mention in case someone who is more knowledgeable than thick old me can shed any further light. 