As for presents, it's usually quite easy to get things for both boys - any Thomas the Tank Engine video or book is sure to be a hit, and this year there are more cartoons available on dvd that they'd like: I saw a collection of Scooby Doo episodes, which would probably be very unpleasant for the rest of us, but Thomas or James would LOVE them.
I think he had in mind something that would be a little more personally hands-on, like the famous Death Ray in 'Chandu the Magician':
But what I think I'll probably get (if it can arrive in time) is something called "Magic Dust". James has been obsessed with a picture of this barbecue spice rub for months. Something about the colours and the arrangement of the font. He really just wants the bottle, so we'll take out the spice mix and give him the empty bottle, which should make him very happy.