300 Miles!! That explains it.
I reset mine about 50 miles before heading to France. I don't know if the reset is supposed to work on the 1.6, but it seemed to give more flexibiity and I could definitely climb hills in 5th that had needed 4th before.
Trouble is, after two weeks of keeping up with French drivers on the motorways, I've now found it's as sluggish as ever.
Should I need to keep resetting it, or should once be enough?