I thought rotating tyres was a thing of the past due to tyres having to be fitted a certain way, that's why there's a directional arrow on them and if TPMS is fitted the wheel has to stay on the same axle it was fitted too.

I took my EGR valve off and cleaned it, but this has now been some years ago !  I did check if the plunger inside worked when under vacuum, lucky for me ive only had a few little issues which I have managed to fix myself. the last time I had bad smoke and lack of power was my boost pipe had blew off from the intercooler due to a jubilee clip had rusted, 

Hi Peter, Many thanks for replying. I saw one of your previous replies to another member on here advising the use of Millers Eco Plus so I have some ready to use as soon as I fill up with fuel. Thanks again   Keith

Hi Keith, I have tried the Wynns EGR cleaner with some intermittent success, but I was advised to use Millers Diesel Power Eco plus and it has worked a treat as I have had the code P0402  only once, and a quick squirt into the fuel tank did the job and it took just about 5 minutes running the car.  Worth a try. Regards, Peter.

Can definitely recommend the 2.2d