Thanks all for your help on this. Allon White did the work for me and told me this morning that the connectors in my pictures are not connected in the standard GDI set up either. I'll still have a look to see if I can see the two sensors from the CAT as suggested but sounds like the leads in my pictures are redundant in any case. From taking a good look under the bonnet and underneath the car it does look like Allon White have made a good job of fitting the new system.
As far as performance etc goes then the upgrade really does see to live up to expectations as being transformative - acceleration in 3rd gear is very rapid and noticeably better than previously. I haven't had the chance to really test it on some familiar routes yet - hopefully we will be allowed to travel a bit more freely sometime in March.....
Alastair
