k11 march ignition problem, pls help

My mums march is playing up big time. When I first got the car I had to turn the key back a little in the ignition when i started the car so all the lights on the dash went off. I thing it was due to broken return spring or something like that.
Now its the other way round. Starts fine but when you take the key out the electrics are on and sometimes the engine is still running with the key in your hand fwn .
You have to put it back and wiggle it so it goes off, but the slightest of vibrations will switch it back on and drain the battery. Any ideas? Also do you know if micra and march ignition barrels are interchangeable?
 
Micra and March ignition barrels are interchangeable, just minor differences on the wiring, but you can make it work...
 
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