Well its not Fuse S1/ST4.
Now starting to grasp at straws..... the Starter Inhibitor Relay (J207 - in the passenger footwell) is controlled by F125 switch so would a fault there give the symptoms I have or would it not allow the engine to turnover/fire at all? But there again I seem to have lost power to some elements of the instrument cluster as I stated earlier which points towards a power supply issue to the cluster..... 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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