So last Monday dropped the motor off at Alfa dealer in Hemel and they gave me a lively little Mito which was fun to drive and quick enough to make me think about getting one.
Anyways, they removed EGR valve checked, cleaned and lubricated. Removed throttle body to find it blocked & manifold filled with carbon. Cleaned out and refitted and now the car runs like it should do. I'm getting better mpg and it's better to drive at low speeds. Still a bit lumpy on start up so doing a little preventative maintenence. As suggested by Sandro the engineer I'll be putting in fuel addatives to keep it clean and not using supermarket diesel but sticking with BP or Shell. The occassional Shell V-Power or BP Ultimate every 4 tanks will be nice too. I'll also drive it just a little harder not too much mind as I want to keep that mpg around the 40 mark.