cheers all, I'll make a note and do some more poking around. in order of your response:
filters et cetera should be fine as they get checked/cleaned/replaced every service. dunno where the fuel filters is physically, but i'll make a note for the mechanics to double check it next time for air ingress
i just drive >100km/h everywhere to avoid confusion.
they can diagnose but have been unable to recreate the issue while they've had the vehicle (i can't write them a blank cheque, so they drive it around a bit and stop/start within reason. doesn't always happen.
trading it in is a consideration but i'm not rolling in cash at the mo' (hence driving a 2008 diesel golf...) so ideally want to keep it movin' until I can just purchase something more interesting and it returns to being the second vehicle.
i thought glow plugs were a bit of a long shot, but wasn't sure what else it could be. timing is a thought, but i'm pretty sure they check all that when serviced. i'll make a note to double-check it all the same.
yeah as above filters get replaced/checked every 6mth service. injector cleaner is what i was referring to in original post, seemed to improve but not fix things. i put a bottle through (3 'treatments'/tanks per bottle) every 2 or 3 months.
if i was going to lease something it would be a Toyota, a Holden or a BMW as that's what my employer get for cheap. i don't want a Toyota, a Holden or a BMW though. also new cars are for chumps, especially in Oz.
Flewy & Schlergen
Yeah it's a 2.0tdi, not sure if PD or CR, it's on the cusp as a MY07/MY08 vehicle. i'd have to poke in the engine bay and it's way too forking hot and humid and dark for that sort of thing at the moment.
i've been trying to avoid the thought of injectors as i know they're an arse and will cost me shedload of $$$, but i'll get the mechanics to check it out nonetheless, as it seems the most likely culprit.
i might google VAG AU recalls and see if i can get them to fix it for me, maybe i can cry about NOx emissions cheats or something....
//editted for stupid quotes not working