Hi all, I drive a 95 disco with a 300 tdi engine. In cold weather I turn on the ignition, wait for the glow plugs to heat up, the battery, which is a year old, turns the engine over sluggishly as I would expect for frosty conditions but the engine won't fire for several turns of the key approx 30 - 60 secs of cranking. The engine has done 132k miles and I can't find any history of the glow plugs being changed. Could this be the problem if not ???? Any ideas chaps, regards.