Well, the first thing you need to do is fix the know issues.

Causes of Blue Smoke
The engine is burning engine oil
Worn cylinders or piston rings
Faulty valves or valve stem seals
Engine over full with engine oil
Faulty injector pump/lift pump allowing engine oil to be mixed with the diesel
Worn Turbo or faulty intercooler

 

Fuel filter. A friend of mine had this exact same issue and that's how he cured it.

Edit.....

Actually that may have been black smoke 🤔🤔 But as Kev states, blue smoke is usually oil residue somewhere being burnt off.

 

Afternoon peeps, turns out I actually put the wrong oil in her using a 5w30,
Checked the manual and it says 0w30,
The engine feels more lively now to,
I’d also spoken to a mechanic friend at my local garage showing him a recording of the smoke and he also said it sounded like valve seals,

since changing the oil the smoke has all but disappeared she’s not using any oil or water either so fingers crossed she’s ok I’ve done quiet a few hundred miles to and she’s runs great mpg anywhere between 40 and 60mpg using a brim to brim to calculate.

thanks for all the replies

 

5W is "ok", but really, always go 0W