more developments unfortunately
On the phase 1 and 2 de engines this should be located on the left hand side of the engine bay (or so the haynes says), Gilo who's kindly supplying the parts doesn't seem to have this chip (his apparently is a phase 1 highport), could there be a reason for this?
On the later models (phase 3, which mine is as it's a 96 P reg P11 GT 'black top') it's integral to the dizzy, if I’m using Gilo's parts of the P10 egt I assume i'd have to get hold of this 'power transistor' (but gilo's doesn't have one visible either?) or is it safe to assume that if his doesn't have one it will be inside the dizzy as it is in the Phase 3?