OK, I got an update for you all...
Having already broken a CD trying to get it out of the unit I removed the whole thing and took the side brackets off and guess what, the 4mm long screw (unit says max 6mm) that I used to fit the side plates was trapping the eject spring DOH!
So for the interest of other doing a similar unit change I'll continue with a small tutorial LOL
Remove the standard unit completly from the car, and take the side brackets off it, then using a small hammer flatten the little lugs down (pic 1) and fit them to your new unit (pic 2).
[img]http://img133.imageshack.us/img133/8284/flattenthelugsls6.jpg[/img]
[img]http://img224.imageshack.us/img224/9499/useshortscrewsqj0.jpg[/img]
REMEMBER to use VERY short screws on your unit if you can see the eject spring through any of the holes!
Take the rubber gromet off the old unit and place it on the threaded bolt (pic 3) coming out the back of your new unit, then place the unit back into the car (pic 4) making sure that you have access to the wiring from both the new unit and the existing wiring loom.
[img]http://img153.imageshack.us/img153/2038/rubberbungbc6.jpg[/img]
[img]http://img153.imageshack.us/img153/3117/buyconvertorfo2.jpg[/img]
Next bit requires you to go to Halfrauds and purchase a cable convertor unit for the princly sum of £14.95 (OUCH!) and as I had the unit in the car I took the old radio and the new (solder ended) wiring plugs to the guy behind the counter and explained what I needed, which he fully understood and found on the shelf for me :$
Simply plug the existing wiring into the convertor and then plug the convertor into the head unit wiring (NOTE! - the instructions state that you should remove the '+' lead from the battery before doing this but being a lazy bugger I didn't (shame on me) and then replace it when the unit is fully connected).
Then you should be able to test the unit out and if all's well re-assemble the console (pic 5), I had a slight bit of difficulty here as the head unit has a couple of lugs sticking out the sides that are a little bit bigger then the hole in the console but a small amount of force and jiggery pokery managed to bypass this issue

. Once you have the console back together fit the head unit cover and insert the removable facia (pic 6) then listen to your favorite MP3's instead of those dodgy old tapes LOL
[img]http://img120.imageshack.us/img120/82/reassembleconsoleandfitdv9.jpg[/img]
[img]http://img134.imageshack.us/img134/2874/workingunitdj1.jpg[/img]
I hope this helps some of you out there as it took me bloody ages (2 days) to do and if I had to do it again it'd only take me an hour LOL