hiya nick, have you had the chance t look into this atall? i know its only a 1.4 but i hate my flat spots and cant affor insurance on a bigger engine yet, would love a smoother pull away.
cheers
Yuley 
I had a look at a birds 1.4spi from down the road, nothing can be done software wise to give any gains, IMO a good service, good plugs, quality oil, performance filter (not cone) de-cat or sports car and good fuel will give you the best results ans should get rid of the flat spot.
Nick