Vortex Services? Looks like you will have to ring them to find out as their website isn't to helpfull. http://www.vortexservices.com/

I've just received a message on You tube about yhe yellow Surveyor I built about 15/16 years ago. The hover is in west Wales. The owner was looking to buy some spares for it. He mentioned bearings and Propeller. Bearings will be pillow block bearings but the propeller I can't remember, I think it was air something or other. I said best person for a replacement propeller would be Bryan Phillips to see what he recommends for a Surveyor. He may have meant the lift fan, but I said I don't know who supplies them now, as Ken Rigly retired. Who does supply lift fans these days?