Have any of you guys or girls done this before????

What tools did you use to undo the retaining bolts on the EGR body?
There are 4 bolts holding it onto the block

1 at the rear retaining the Cooler bracket
2 in the middle where the EGR meets the Cooler and
1 under the front below the belly of round control module

The first 3 I have removed ( undone as they are obstructed by pipes and the suspension turret
The one at the front of the engine i can not seem to get at to get a spanner on- even my bent 8mm spanner will go on the bolt but there is no space to get a turn on it

Big Engine- Small Space

My trusty bent 8mm with tape tail so I can retrieve when dropped

I am open to any suggestion, I can't get a socket on it as they angle down and there are pipes in the way, I have seen S shaped spanners for sale but not sure if even they will do the job