Glow plug light is flashing, points towards injection system issues. Engine light backs it up too you see
Get a full scan of the car.
Injectors chances are it will be 1 or two. And you can pick them up for around £150-180 new, or used full sets for £150.
http://www.ebay.co.uk/itm/NEW-GENUIN...item3f108ede2b
http://www.ebay.co.uk/itm/ASB-BKS-BM...item336e92b497
Easy job!!!