hi thought I’d take some pics of me fitting my head unit to my 03 plate 2 hope it’s of some help to someone. (It’s only a rough guide don’t take my word for anything, don’t start if your unsure)
Parts used
kenwood kvt 627 dvd
audio wiring connector PC2-17-4
Auto leads facia plate FP-11-03
standard head unit ready to be removed
forgot to take a pic of the next part 
remove the side pieces to reveal the screws that hold the stereo and ashtray
remove heater knobs and 2 screws behind the left and right heater knobs
pull of the surround for the heater controls and unplug the clock
you will see 4 screws holding the ashtray remove these, unplug the cigar lighter
4 more screws on the head unit remove and unplug all plugs and aerial
all these wires 
with my head unit i had to run the cables in for the brain of the head unit. i fixed this in the passanger luggage compartment behind the seat
with the new facia part and wiring adapter follow the instructions that came with it and you should end up with somthing like this. on the wiring adapter you will NOT use all the plugs from the original stereo
i then powered up the head unit to check the screen didn’t hit the heater controls
whilst i was at it i did the window switch mod just cut the 2 wires on the window lock switch leaving a couple of inches to resolder the new wires to. join original wires together then cut the blue wire on the wiring adapter which should be the electric aerial control (check the packet to make sure) extent this to either side of the window lock switch, thats is no more aerial up when listening to cd’s or watching a dvd 
replace the ashtray and take off the surround from the original stereo clip on the new facia plate, replace the side panels, thats it one head unit fitted
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