Imagine the scene.........
Accelerating hard on the A38 this morning

I feel something fall and hit my leg.....

I assumed that it was a pedal rubber.....
But no....

After a bit of grovelling around - I found the heater control knob on the floor.
Some time later, I examined said knob, and discovered that it's held in place by a 2mm allen headed grub screw.
And here it is......
Just so you know.