Vectra c diesel slow starting


Wrench Pro
VW Polo 1.4TDI
My brother in law has a 56 reg Vectra 1.9cdti. When leftover night or for even a couple of hours the car turns over normally but doesn't fire for about 10-15 seconds. We have changed the fuel filter and have changed the glow plugs but the problem still persists.

Any ideas what to tackle next. Someone mentions the fuel leak/return pipes are worth changing.

Before we throw any more money at it is this the resolution or is it something else.
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