Hi,
Thanks for the reply.
I got it working now, thanks.
It looks like it does have to be "Joystick0" for the start button to work.
I had an ancient PS 2 thrustmaster gamepad charging from my PC. I disabled this, and my wireless 360 controller started working (XCOM 2 has the same problem).
However, if I have 2 wireless 360 controllers on, the "start" button on the 2nd one is ignored from the start menu. So, it's not really a problem for me any more, but anyone who has more than one controller connected may have issues, I think (e.g., util recently I had a wired steering wheel as Joystick0 + wireless 360 controller).
I enjoyed the demo once I got past the first bit, for me the level with all the bends (I think, this is the one after the first "proper" level, straight with the keep left/keep right signs) was where it started getting exciting:)
Ah, one more question: Is the game OK for my young kids to play (no swearing etc)? The little bit I've played of it looks perfect, but best to ask:)