Thanks for the replies, we did a video outside but the light wasn't good - so we'll try it again. In the meantime, here are some videos of him in shorts. The last one is him standing on one leg and bringing the other knee up. Though ive just realised perhaps i misinterpreted that - perhaps one leg should be in front of the other.

anyway, here are the videos, and we'll do some more.

YouTube - Learning to walk again 2

YouTube - Learning to walk again 3

YouTube - Learning to walk again 4

YouTube - Learning to walk again 5

YouTube - Learning to walk again 6