squeaky steering wheel

I've noticed over the christmas period a squeak inside the car. At first I thought it was coming from the pedals but I think I have now traced it to the steering wheel.

When I turn the wheel to the right, not immdiatetly, but after say an eighth of a turn there is a squeak. Doesn't happen all the time but noticed this when stationery and assume it is the wheel which is therefore squeaking when driving.

Any ideas of cause and fix - it is a lubrication job? in which case I'll mention when the car goes back to the dealers again in the new year (hopefully) for a couple of other faults to be rectified (currently awaiting for a new part to come in).