Both the Picasso and the Maverick have a bit more grey smoke than usual on start up at the moment, the Mav passed the MOT yesterday and had very very low emissions, less than 1/3 that they needed to be.
So I wonder if the fuel we are using at the moment has a different blend or something.
We are very loyal to the fuel stations, in the way that we always buy the cheapest, but usually alternating between Morrisons and Tesco.
I haven't checked the Mav's glow plugs for about 6 months, but it does tend to run a bit rough when one has gone, but only noticable in the really cold weather.