This was very easy! I must say
Not sure if the later model head unit is held in differently or not but this is the head unit I have

Tools Required:
Phillips Screw Driver
Flat Head Screw Driver
STEP 1: Stick the flat head screw driver into the slots and try and push the trim towards the rear of the car

STEP 2: Undo the screw on both sides (2 in total)

STEP 3: Some people out there say they had to remove a 10mm bolt on the side and some say they didn't.
Well either way I couldn't find the so called 10mm bolt.
So Step 3 for me was to just grab the head unit and pull it gently towards the rear (It's clipped in, so be careful once the clips let go, that head unit will just fly out)
Before pulling the head unit out I would put the gear stick as far towards the rear of the car as possible and maybe put a cloth over it and also put the handbrake down to stop any damage in the event that the head unit does fly out (Do put your foot on the brake because you've just put the handbrake down and I don't want to hear about someones car rolling down the drive way while using this how to)
To refit do the above in reverse
Here is a picture of the rear of the headunit

Left socket is for the headunit
Right socket is for the CD changer (iPod kits, GROM, XCarLink units plug into here)
For those who are interested the socket has 16 pins (2 rows of 8 pins) and the overall dimension of the plug to fit in that socket is ~23.9mm x ~12.7mm
Bottom socket is for the fan controls
To refit do the above in reverse
How to Remove the Glove Box
STEP 1: Remove this clip

STEP 2: Push the two circled points in the first picture below so that the bit that stops the glove box from falling any further (picture 2) does fall further
Picture 1:

Picture 2:

Now in that position it should just fall off
To refit do the above in reverse