You will need these
http://www.rimmerbros.co.uk/Item--i-DYC101360
You may be able to put your hand down with the bonnet open, but id take the bumper off. 4 nuts when you open the bonnet, 4 underneath and 2 either side. Watch you dont unscrew the wing bolts instead as you may get mixed up and remember to disconnect the fog lights when you pull the bumper away.
Stephen