Citroen relay 2.2

[Spudbelly]

Morning all,
I am looking for a little help with black smoke.
I have had a full service replacing filters etc , new maf filter, checked for air leaks had a new catalytic converter fitted and replaced the injectors and had the turbo checked but it's still the same. Runs perfectly but starts off with white /blue smoke then from 3rd gear upwards it bellows black smoke.
Any ideas what the issue may be would be greatly appreciated.

[EDC5]

White/blue smoke from start-up can be oil in the cylinders. Has it done a particularly high mileage?