No airbag or horn

My airbag warning is saying not connected, and the horn don't work from the steering wheel. A mate mentioned an airbag rotary control unit would this be my problem, and if so are they easy and cheap to replace.

Also anyone got any dash vents (x2) for a 2000 model they want shut of, ive got two on mine that have fallen apart

That does sound like the rotory coupler, they're easy to replace and they're about 100 quid