@clydey, thank you for going to all this hassle,
my car defenatly has the MEMS 1.9, the colour wire going in to pin 86 is the grey/blue as you mention. not looked on the ECU as its at the back of the car and hard to get to it to take off the connector to see, but the relays are at the front of the car and easy to look at and take out
I am sure mine, even though its a MEMS 1.9 would be like the description you mention, would placing and LED (light emitting diode) on the ECU side of the connection I'll be making (location "C") stop any problems occurring?