Landrover 90 2.5 Petrol starting situation

Hi one and all. I am real Landy nut having just bought my 7th. This time a 1987 2.5 petrol. Lovely and quiet at 50.
I have had this Landy 2 1/2 years and spent loads on the old boy (Joe) Reason for name is that when I bought him, he was multi coloured. LOL
My biggest frustration is that old Joe only fires up when I turn the ignition switch OFF !!!!! He turns over fine for hours but just does not fire until I switch the starter motor off. I have already bought a new low voltage starter motor but this has made no difference.
Electronic ignition fitted now and this has made no difference to the starting situation.
The coil is still the original and has done a faithful job over the last 30 years. Surely this is not my problem as he runs perfectly when started.
I know these engine had starting problems but not like mine. The new engine has done 2,000 miles.

Does anyone have any ideas for me .

Welcome to the forum

Hello and welcome from me too
Post in the defender sub forum for a better response.
If you flounce now I know it's me.

Thanks Flossie, still finding my around this forum.
Old ginger

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Hi and welcome!

Don’t forget some pics of the 90 and some me suitable security measures for it!