Key wont turn in ignition

[puglove]

Im pretty sure when i took one out, i was pressing on the tab on the side with a screwdriver turning the key slowly at the same time and eventually it went.

This ^^^ should be 2 or 3 goldie looking tabs poking through the side of the barrel cowling, (if you push one up they will all go at the same time) put pressure on one with a screw driver and slowly turn the key. at some point they should pop up,

Also, once you have the barrel out, undo the two screws on the back and the wires will come out the back of the barrel saving you having to faf about trying to get the plug through.