Just done this job in 4 hours.
Remove top of air filter and put aside.
Undo coolant expansion unit and hook hose around bracket to hold out of way
Remove 4 bolts on air intake manifold.2 hex at rear. feel with fingers.2 hex behind front of unit, one to left of oil cap and one same place other side that you will need 8mm hex with long shank to get by cylinder head nut.
There is connection for glow plugs on right of manifold, a breather pipe and clip on left of manifold to disconnect.
lift manifold slightly and unscrew air intake unit from front of manifold when you have diconnected pipes.
now you have to wiggle jiggle and prise the plastic manifold out of the 4 metal pipes at the back, there are rubber ring seals around them and are held in by friction. Jiggle manifold over the engine cover and remove,you will need to remove oil filler cap.
The glow plugs are now easy to replace,be very carefull not to break the tops with the socket, and tighten carefully to 16 Lb only as overtightening can damage the elements.
When you reassemble dont forget as I did to screw in the front assembly to the manifold before screwing it down.
Roger Hayford, October 2010
