Well here is an update to my 'problem'
Car was in for it's 60,000Km or 2 year service earlier this year. After the service the car has not missed a beat

Only thing I can put it down to is shot spark plugs or a partially blocked fuel filter as these were changed in the service.

Have ordered a new DV the new piston type and also have a new fuel pump cam follower sitting on my desk ready to be put in as a preventative messure, after all the car has a few KM's on it with the tune.
Now I'm thinking of getting a Milteck dump pipe and asking for a stage 2 file from Superchips, bit worried as 2 poeple I know of have had issues with the upgraded file and to fix it have had to resort to swapping tunning companies. What sort of feedback has the Stage 2 file been recieving in the UK?
Thanks for everyones help.