Update the Egr has been blanked off so the map must have been EGR delete. I still have the issue of white/blue smoke on start up and rough running for a very short time. I have also noticed that the glowplug light only stays on for around 4 seconds. Have tried the ignition repeat trick does seem to reduce the smoke. .
Mine has the EGR blanked and DPF cored with remap. I have read lots of info regarding the white smoke on cold start up on here and various other sites, all of it points to excess unburnt fuel on the start up cycle passing through the exhaust. I cure mine by doing 3 x glow plug cycles every cold start, I have no smoke and no initial hesitation.
On speaking to MotorMech, they say that this is common when the DPF has been cored out. They also checked the swirlflaps on mine and they are fine.
Just read above, On your recommendation I will give the Rhino additive a go, I'm not usually one for 'magic' additives, but lots on here seem to swear by it.