BRE Pd engine prob

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Drove to Wales 64 mile journey with no problems, nipped in a shop, came out, tried to start the car, it just shook and there was a right clanking/grinding noise.
Switched it off and got recovered. Its a 2007 Audi but its still under warranty, but ive looked at the warranty and it states repairs up to the value of £750.
Its done 84000.
Does it sound as if it will be the oil pump issue.
Or could be an injector problem, a known issue on the BRE Pd engine
There was no warning light on the LCD, no oil light came on either.

Just looked at the log book and mines a 140 BRE 145919 engine

Cheers

Any advise would be appreciated

 

[cpbrad]

I have just purchased an a4 2007 with the exact engine and im going to domsome tuning, stage 1 defo and possibly eventually stage 2. The more I read the more scared I'm becoming about this particular engine. I only got the car 2 days ago..