Well I changed the rear EGR pipe. (CXEB 204 BiTdi)
What a nightmare of a job! Had to buy some different length spline bits and a dumpy ratchet.
Moved the pipe clips round, as they took the skin off the back of my hand, so that helped a bit, dropped one of the exhaust-end bolts down into a crevice on top of the gearbox next to the g/b oil cooler, I found it with my DEPSTECH camera but the bolt turned out to be non-magnetic so couldn't retrieve it with my telescopic magnet, so had to order a little grabber tool to get that back!
Used the camera to get the spline bits into the bolts and eventually got the ratchet onto the small extension bar and got them all out.
was a bit of a fiddle getting all 4 bolts back into the new pipe but eventually I got it done. Slid a tube over the 3/8 ratchet to get a bit more leverage to nip them up, the torque is only 20NM so just about doable.
I would like to put my boot up the arse of the bloke who thought that was a good design!