JUST BEEN IVANISED!

[MadDogMcQ]

....That comes from clipping the carb springs, I believe, so maybe yours hasn't had this done, or maybe they weren't clipped to the right length ie short enough...

Hi AyJay,
The springs were clipped to the correct (updated) length - 4 coils off. As I said in the original post, the mechanic game me back the spring-ends which he'd removed. The throttle is indeed "snappy" when you blip the throttle.