Post Photobucket Reboot.......................
"No admittance" always gets me wondering. I've never much liked being told what to do, so this week I obtained a set of security fastener sockets, so that I can get to places which are not allowed.
Those with eagle eyes will note that the bottom row contains the socket which allows access to the box on the bulkhead under which the ECU's lie.
From Maplins................

It was quite scruffy under there:

This is the black box label:

This was the mess under the silver box:

And these are the references under the silver box:

Anyway,it's all clean and tidy now!
Apologies for the side on and upside down images!!!!!