DS turns 4 at Christmas time. He mainly plays with vehicles, and already has loads of trains/brio, fire engines, tractors, diggers etc you name it. He does play with his kitchen, sometimes, but has everything he could possibly want for that.
He doesn't have a great imagination and tends to just act out things that have happened in real life with his vehicles complete with a lot of sound effects (he may or may not be on the spectrum).
No idea what to get him for Christmas...and birthday! Any new vehicle would be very popular for a while, but he has everything.