Earlier at a mates house i turned my car off, went to remove the key but it wouldnt come out of the lock! i could turn the ignition back on but i couldnt start it. when it was locked into a position (i.e. ignition on) it can be twisted quite a bit without any effect. it seems to not be very 'positive' anymore. eventually i was able to start it and turn it off again, and get the key out. its been fine since, except the key being a bit slack. time for a new ignition barrel? or is something just a bit loose, or not likly to occur again?