Hello Darren,
Blue smoke indicates oil burning, and if it is, it would not be associated with injector issues.
Could you carryout the following tests and come back to us:-
Take the car for at least a 10 mile run to ensure the oil is up to operating temperature ( that will be quite a few miles after the coolant has reached temperature.
Leave the car ticking over for a couple of minutes and then get someone to increase the revs to around 1500rpm and hold it steady at that, while you observe any smoke.
Get someone to follow you in your car and ask them to observe any smoke that may occur when you accelerate - not daftly, just sedate acceleration.
Perhaps you could let us know the results.
Also confirm you are not confusing grey smoke with definite blue smoke.
Kind regards,
Gareth.
p.s. Location:- King. Where is that?