The clocks pipe is connected as I'm getting an MPG reading.
All the connectors on the intake boot and top half of the inlet manifold are 'wired' in correctly - they all have pipes connecting to somewhere.
I guess this is going to be one of those small mysteries of life. All I can think is that in the past someone has put the pipes back the wrong way, which has left this one loose.
I took it for a test drive, and it seems okay, a little smoother if anything, it smells less rich and mpg was up a little, but power felt a touch down. Could probably do with the CO re-setting now.