[Arctic]

Hi John.
I know you may not want to do this again but you can fit the 10mm nut by removing the intercooler hose and bend.

To help with more access remove the 8mm bolt holding the header tank in place.
1

Lift it off the two lugs holding it to the rad.
2

Lower it down onto the coolant pipes.
3

Undo the hose to the EGR.
4

Undo the bolt in your case the cable tie.
5

Pull out the hose with the bend attached.
6

You now should have enough room to insert the 10mm nut in its recess on the bracket to help or aid you pop a little bit of blue tack on the nut or in the recess.
7

Once you have it in place you can then refit the bend on it's own with out the hose attached, pushing down firmly making sure the fixing lug is the right side of the bracket, you should hear a thud as it seats home properly.
8

Now fit the bolt which holds the bend.
9

The intercooler hose can now be fitted to the bend & EGR turn the clip around on the hose so a long screw driver can be used at an angle to tighten it, removing the light protective cover will help also.
10

Hopefully this should get you sorted out once and for all