hey everyone, thanks for some input and suggestions.
It is fixed, took less than an hour of my time. Here is what happened and how to fix it if anyone ever has a similar problem:
When you turn your ignition to position one, you can feel resistence. What happens is as the key turns it pushes a shaped length of metal into the center of the ignition switch and begins to turn it. As the switch turns it makes contact with the various circuits etc., until you turn it all the way to start the engine. At each stage of the key turning, i.e. position 1, 2 and starting the engine you feel resistance. When you get this particular kind of problem the key just spins, the reason being the the metal rod has become jammed in the switch so therefore you cannot turn the engine off because you cannot turn the power off to the switch, hence if you stall the car all the cars functions are still powered.
First thing to do is remove the lower drivers dash panel and also the lower steering column cover to expose the barrel and ignition switch itself. From the image you can see the ignition switch and the location of the grub screws that need to be undone to remove the switch.
The grub screws will be covered by a red sort of wax that need to be cleared away. This exposed two grub screws (one either side of the switch). Undo them with a very small flat bladed screwdriver about three turns and the switch should very easily separate from the casting. Now you can see the exposed end of the ignition barrel and the jammed metal rod. With a pair if pliars turn the rod back towards you, it will snap back. When it moves back to the "off" position, i.e. where you would normally be able to remove the keys from the ignition, you should see (and hear) it pop back. You can now refit the ignition switch and the car should now turn on and off as if the problem was never there.
We're still going to replace the barrel. But at least it's ok
To Replace the Barrel:
You need a rod approx 1-1.2mm in width or a small allen wrench. Put your key in the ignition and turn it to position 1. Now look to right of the key at the barrel and you will see a tiny hole. Poke the rod down this hole and it should press down on some kind of releasing mechanism and by pulling the key the barrel should slide out.
I hope this isn't too long winded but if it stops just one person having to suffer the crappy experiance I just have then it is worth it.
Thanks to Mystic Sport