Clicking noise when entering key
 

This probably seems very simple but thought I'd ask for piece of mind......
i have recently removed my radio and centre console on my c30 and have only had the car for 3/4days, after replacing it the clicking noise appeared, almost like a locking noise.
Im probably being over cautious but I have a clicking noise coming from behind the steering wheel when I enter the key and remove it which I don't remember being there before I started tinkering however it might well of been, can anyone clear this up for my simple mind!

Many thanks, Tom