The wheel is not from an Ariel, too few bolts and wrong type of casting number. I don't know what it is from though. Qualcast, who were manufacturers of lawn mowers had a large foundry in Derby and undertook sub-contract work for many companies including Ariel. When I worked at Royces, I was told, that engine testing couldn't be done when the wind was in the wrong direction because of the s**t from the Qualcast foundry just up the road.
Worldwide Membership Secretary
Semi-retired partner in Draganfly Motor Cycles