Andy brilliant how to, esp with the later additions about the wiring clip/vac pipe stub. The thing that springs to mind is that having seen inside now, the only reason to do this from a vacuum, loss of power, limp mode, vac pipe perspective, is if the vacuum pipe from the map is not holding vac. There is a direct connection from the engine bay map pipe, to the ecu internal pipe. Therefore if you pump it out with a mini vac, and it holds vac,this little pipe inside is also ok. So still got my limp mode going on, but interesting bit of fact finding.