Thanks, Ken and Paul.
That was exactly what I needed to do. I had to fish for the thin white wire but it was there just behind the cable for the seat lock. I’ll try and upload a photo to show what you have to do.
Once the wire is disconnected the default yellow setting gives 45 km/hr. The green setting seems to be for saving energy and drops the top speed to around 30km/hr but the red one removes the limiter completely – so it may not be prudent to use that in public.
I’m looking forward to my next journey on the Model 30. I’ll take it out onto the B road that leads from Dumfries to Glencaple and see how it handles with its power fully restored.