Blob
This is a very belated thank you for pointing me in the direction of the Mislabled Child. I finally managed to get my hands on a copy a week ago and it's been enourmously helpful and I haven't even finisnhed reading it yet - I keep pointing out bits DH should read and it's one of the few books he's been happy to read.
I'm sure things will improve with age - he's certainly much better than he was a year ago though a lot of that has been because of the effort put in not only by us but also his school and other carers who we shared his test results with. We all have a better understanding of who he is now.
You might also be interested in the following article on kids zoning out and daydreaming, "New research shows some types of optimistic daydreaming are productive, improve IQ and inspire resolve". I haven't looked at the research yet but the ideas presented make a lot of sense and provide comfort to me as a parent of a daydreamer.
http://www.smh.com.au/national/education/time-out-boosts-brains-20100801-111fk.html