Update: Changed my glowplugs today.

Easy job, even without taking the fuel lines off, there was a slight difficulty getting in there but not that hard. Took about 1 hour to change 3 plugs out of 5, and I lost 20 minutes of that when I dropped the wrench directly into the engine area on the right side of the bonnet, and it wedged itself way out of sight. I had to crawl underneath and dig it out. Was not fun.

However after changing 3 plugs the car started up perfectly, much easier than ever before.

Thanks for all the help guys and info, much appreciated.