about 6mm long
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I wish I had taken more photos now....
I was on a woodland walk at the time and using a borrowed camera, as I didn't want to hold everyone up . so I took a few snaps and ditched the seedhead. If i had realised what I had I would have brought it back to the house and got a descent photo.
It must have been terrible for the fly :(
Lat/Lng: 55.8264, -3.5887
OS grid ref: NT005603