Ford Focus clicking noise in steering wheel column + idle revs

[Southwell]

Im hoping someone can help me here....

When i turn left or right at any speed there is a clicking noise coming from the steering wheel, it did stop for a bit but is now just persistent. Any ideas from cars folk?

Also another problem. When i put the air con on, or light, or heater the revs drop below idle and it almost stalls, it's done it for as long as ive driven it and it's really annoying. When you have the lights on they dim and then come back and the heater only blows properly when you have the revs above idle.

Please only post if you have any recommendations.

Many Thanks