You have to remove the engine cover air ducting (if its in the way, only on a few cars), then the left and right air intake ducts.

Then unhook the bonnet release cable where it attaches to back of the air intake cross member.

Then you remove the air intake cross member which is held in with 3 catches along the front

Then the grill itself pivots out as you unclip some more catches

- sorry, its a bit hard to explain without photos/pictures

Richard