The boss just came in and said "Did you see Top Gear last night, they decided to build their own electric car". Unfortunately I didn't, as I was doing something much nicer - having dinner out.
But I digress. Apparently (of course) they ran out of juice. At which point May says "let's put a diesel generator on it."
EDIT: The BBC appears to have removed the vid from Youtube. UK readers can watch it on iPlayer
here. Some other clips have popped up on Youtube, but best to search for Series 14 Episode 2 yourselves rather than try to link them.
I'll PVR the whole thing for the repeat tomorrow.