Thanks for all the advice so far.
Ryan, "land slug" cause of what it likes to do offroad - steep bits and 4x4 it seems to like crawling up things around 1700 - 2000 rpm.
Slug - had the local mechanic do the glow plugs, I was nervous about breaking them offThey've invoiced me for 4, will do the multimeter tests later today and see if one is faulty.
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