"compression ignition fault " do mean the oil seals have gone on the valves or the rings are worn .Normally blue smoke is oil burning due to a worn engine .I would want a much better description of the diagnosis and a much better description of what they are going to do to rectify it.

Edited by Collos25 on 23/02/2013 at 19:57

This chart is good for smoke-related problems...

uniteddiesel.co.uk/diesel-engine-smoke.php

But they should have told you what the fault is - not 'compression ignition fault'! What's that supposed to mean? If a mechanic came out with that to me, I would quietly take my car elsewhere, which I think many here would recommend you to do!