I think I have it sussed. Driving home from work last night it did the usual judder stuff however this time I pulled over and sat it in neutral.
Needless to say the engine juddered all over the place but this time the exhaust sounded to be blowing badly.
I got the CAT replaced approx 3 months ago at KwikFit.
Next day, the exhaust sounded as though it was blowing, but only at cold.
I know this cannot be the case as the entire system has now been renewed. My only thought is that Kwik Fit didnt put it together correctly.
Anyhoo, recently the car has been losing power and the engine juddering on occasion with the emissions control warning light coming on.
The blowing sound is now quite loud.
My question is, would the engine lose power if the exhaust was blowing due to bad fitting at the CAT?
Also, if I remember rightly there were two flexijoints in the exhaust, and after kwikfit, there is now only one.