Well - figured how to get the cover off.
All excited about getting it installed and guess what - the plug doesn't fit. Looking at it carefully, there are plastic rails inside the female plug and you can see that they are no way gonna line up with the plug comming off the ECU (going into the common rail).
So now I've got to wait for a new lead to be sent I guess.
Is it just me that this kind of thing happens to?!
Will contact Mike in the morning and see what's what.