You have a Peugeot 306 19 TD when you put your foot down it smokes a lot but it has only done 30000 miles any suggestions?

sometimes if a diesel car is driven around town or on low revs deposits can build up in the system especially if your not using the turbo then when you put your foot down it all gets blown out.this is why its good to give it a good run down the motorway just before a mot emissions test