We were in there about half an hour, but the babies were not playing ball, and the picture quality wasn't very good (see pics below!).
The sonographer said this is partly due to their position and the amount of fluid around their faces, but I wasn't completely convinced! They have offered to do another one for free next week, so at least we can try again.
For now though - this is the best we could get:
Twin 1 (Righty!)
Twin 2 (Lefty!)
And a 20 second video clip of each too: