It should be OK and whilst I have every sympathy for the garage having been in this situation a million times they have shot themselves in the foot by starting the job without asking you first. If they had called you and said there was a danger, as there always is, of a glowplug snapping and asked if you want them to carry on at your own risk then they would be Ok but as it stands they should sort it out.
As far as I was able to find out, unauthorised repair is a strong case. The garage admitted it to me privately, but what if it will be my word against theirs when it's in the open and they deny it? I can provide indirect proof (calls time etc) but what in that case?
P.S. Updates so far: spoken to garage again, they say I am a 'difficult customer' and refuse to speak. Sending a recorded letter next...
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