About 30 years ago veteran English Rodder Ken Cooper told me the Ardun units were used on (some) refuse vehicles. He had some. If just one city or council fleet had just one vehicle fitted with them, then the story is true. I believe Ken, and this version pre dates any internet spread myth.
In my mind it is true cos Ken don't lie. Not all would have had them, and even if as few as one or two, that's enough. Ken is a great character and can be seen at various events in the UK. He recently built as a joint venture with his son, Bradley, a flathead powered dragster, and they campaign it regularly.