Just want to say that I had the most wonderful experience taking 5 yr old DC with ASD. I booked a ticket for him, getting a free carers' pass and complimentary fast track.
Despite being Valentines Day (and huge queues), not only did we get tickets almost immediately but also got a goody bag full of London Eye goodies but we also got on to the Eye straight away. DC absolutely loved it and there was no stress involved whatsoever.
Can highly recommend it