Looked at Isuzu forum and found some info, ended up being oil pressure sensor on injector rail.
Touch wood, runs like a dream! Customer well happy.
Forum I used was www.itoc.co.uk really clued up guys, well worth a try.
Message Thread 
Isuzu Trooper 3.0 1999 - Bad starting when hot - Fixed # - Neil Crunkhorn May 3, 2010, 10:22 am
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