Firstly, you have to look at taking the bumper off, this is pretty simple to do, you need to pull out all of the plastic clips along the metal bar that goes over the lights:
Then you need to pop out both indicators, so take out the screw that is on top of each one and pop them out. After this look under the front wheel arch at the top of the bumper, you will see an 8mil nut and a plastic clip under it, take both of these off on both sides. Following this, look along the top of the large grill and you will see two more plastic clips, pull both of these out. Then take the two screws on either side that the mud flaps screw onto the bumper with. After this you can take the 10mm nuts off of the bolts that are behind where the indicators where. After taking this nut off of both sides then the bumper will come off, just be careful you don't catch the wing with the bolts like I did
Then dis-connect the sidelights and fog lights and sit the bumper elsewhere as this makes it easier as you don't have to faff about with it.
To get the head unit out from here, undo the two bolts that are either side of the unit and then un-plug the lights from behind and the whole unit will pull away, it is easier to un-plug the wires as they will hold the unit in place so it doesn't fall out lol ... (The message box is jumping up and down so this will be done over a few posts as it is annoying the hell out of me lol