I just cannot get on the top bolt, starter motor side. The wiring loom comes down close to the rear of the starter body, and this prevents getting in any of tools I have. It's a 6mm allen; I think maybe a long reach allen key on a socket might *just* slide in past the solenoid, but I don't have one. And there's not really enough room to get in there with 2 arms; well not unless you are like the aforementioned Orangutan
For anyone silly enough to try here is how to get to the point where you can't get the bolt out!
Jack up NSF and remove the wheel and arch liner (6 or so plastic rivets). Remove the 13mm bolt you can see in front of the strut, and clean and plus gas the other 3 bolts sticking out (one is hiding behind the spring!).
Refit the wheel, and run it up on ramps
While the BSI goes to sleep, remove the front flexi exhaust section - just the two clamps (the rear one is awkward over the subframe).
Unbolt the vac reservoir (a wholly OTT 16mm bolt
) then lever if off the clip at the NS; this will give you access to the top to unplug the vac hose(s). I found this very difficult - possibly it would easier if you depleted the vac first as there was a hiss when I finally got it off. If you disconnect the one on the OS, then there is room to tuck the res out of the way to the other side without needing to remove the other hose.Back to the top, remove the air hose, battery clamps and cover, then holding down clamp on the OS and remove the battery.
Remove the 4(!) 13mm bolts from the tray - one at the front, 3 into the wing (those you cleaned earlier!),and then the T27 bolt under the battery clamp and lift out the battery tray
Disconnect the earth point on the top of the gearbox.
If you now get a mirror and look under the thermostat just to the rear, you will see the top starter bolt - a 6mm allen. I managed to get on this with a short and long wobble extension, that allows the end to come up above the battery tray, with just enough room to get the ratchet on the end.
Back underneath, and there is a 13mm nut you need to remove - it's sort of above and forward of the solenoid; you can just see it, but it has to be undone by feel.
13mm and 8mm nuts to remove the wires from the starter.
You are now at the point I got to - where I cannot get a tool onto the top bolt....
