Smoke from under car
 

Today noticed white smoke lots of it for approx 10 seconds coming from a small exhaust pipe under the passenger side any ideas what's causing this

And am I right in thinking this for aux heater

Could be,if you have the webasto heater!Look under the car and you should see a miniature exhaust pipe outlet!

Yeah it is any ideas why white smoke and diesel smell

Hardly use it and I only turn my webasto on ,periodically,so that it works,but when its on ,I can smell diesel burnt fumes but no white smoke!
However,temperatures here are 16 deg + ,but if temperatures there are 10 or less,the white smoke you are seeing maybe just be condensation.
None the less ,check for any diesel leaks from the webasto as white smoke can also be unburnt diesel.

How to you normally turn the webasto on?

It was definately white diesel smoke car has been
Parked for 3 weeks with the odd crank but no driving could this also
Affect it

I have a remote control that came with the Webasto but you can time program it on OBC under aux heater.How did your webasto suddently come on?
If you had the car parked for 3 weeks ,then I would say its condensation.