I have a buzz coming from the small pop can box under the steering wheel near to the drivers right knee, had it for over a year now but it is getting on my nerves now, the buzzing stops when I open the box . Anyone got any idea how to get rid of the noise.

First, see if the little 'ON' slider's the problem by giving it a jiggle. Otherwise, if you look at the guide I did for the evaporator temperature sensor (sorry, on phone so can't post link for you!), you'll see where all the screws for that part of the dash are, so you can slacken them off, give it a good bash, then tighten them up again...