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Thanks for your interest Elizabeth. This is what I did...
I spooned some of the rotted fungus into a plastic bag and brought it home. Then I kept it in the bag opening it from time to time to let some fresh air in, and to photograph the larvae and then the pupae. Then when the adults emerged I transferred them into a fabric bag with a plastic window in the front. I can't remember what this was sold as, but I have used it as an insect house from time to time! I added a damp tissue with water and some honey on it which they visited frequently. I sacrificed one male fly to photograph. I was hoping that the remaining 4 adults which eeventually emerged might lay eggs in some old mushrooms and the remains of the original honey fungus, but no signs so far. A couple of the adults have now died.

I'm not an expert so have assumed that the larvae, pupae and adults are all of the same species simply because they were all found in on or around the honey fungus.

Best wishes,
Martin