No, the grey wire going to male pin 38 in X1 goes to the pin marked Clutch switch. As that is there, you have no need to go anywhere near the UEC. There is no point as you have access to the other end of the cable at X1.

You will not find the terminals in any shop on the high street, particularly Halfords. Took me ages to find them all, but this is the female one which can clip into that connector http://diagnostics.org.uk/shop/loom-...l-contact.html

The switched live wire is spliced onto another wire from the factory, you have no option but do the same as there is not a spare ignition live in X1 you can just pop a connector in.