Will look into the Pimping, thanks!
I run a single tank - normally with 10% unleaded mixed in, or 20% diesel. It's a bit of a cranky start but never lets me down (touch wood).
Glowplugs now are on a manual switch. I turn the switch on for 15-20 seconds then start the car with them on, and turn them off after about 15-20 seconds of idling.
Couple of mine died though
after I left the manual switch on for an hour on my driveway...

Couldn't find any info about longer plugs, just think I remember reading something a while back.
I did change them a couple of years ago and used BERU plugs, so I know the pain no.5&6 cause!!