I remember that dip switch. There was one on my Morris Minor.
If you got the revs right you could use it instead of the clutch.
It was the first car I ever drove, slightly illlegally, when moving my old man's ex-GPO van round the entry.
Second (when I was about 15) was his Chrysler 2 Litre (a posh version of the 180, if anyone remembers them). I took it round the block when he was kipping on the sofa, half way round met the insurance man coming the other way, who waved cheerfully and let me through.
I had to race back to get to the door first, and then make sure after that I always answered first when he called. If he'd mentioned to my dad that he'd seen me driving I'd have been for it!
Happy days!