OK fellas thanks for that

It's also beginning to jerk sometimes. Last time it did this i changed the coil pack but that didn't help so i cleaned the MAF sensor with electrical contact cleaner. This seemed to do the trick as i was concerned that it was coated with the 'tacky' spray that i'd coated a pipercross panel filter with so i changed it for a K&N one so i suppose the coating off that could have done a similar thing over the last couple of years?

Lastly, best place for a new idle control valve?

Cheers guys...