i would pull the EGR valve and EGR pipe out first and give them a good clean up and also clean the throttle body
get some EGR cleaner from halfords and get some DPF cleaner from euro parts and run it with a full tank
http://www.halfords.com/#
http://www.eurocarparts.com/ecp/p/car-ac...&0&cc5_862
if this does not solve it then get the car looked at
as a replacement EGR may be needed
or the DMF may need checking over injectors etc,
follow this thread your engine will be slightly different but more or less the same
https://www.vxoc.org.uk/forum/Thread-2-0...BODY-CLEAN
get some EGR cleaner from halfords and get some DPF cleaner from euro parts and run it with a full tank
http://www.halfords.com/#
http://www.eurocarparts.com/ecp/p/car-ac...&0&cc5_862
if this does not solve it then get the car looked at
as a replacement EGR may be needed
or the DMF may need checking over injectors etc,
follow this thread your engine will be slightly different but more or less the same
https://www.vxoc.org.uk/forum/Thread-2-0...BODY-CLEAN