Paul's post reminded me of leaf mines I photographed on Red Clover at Kenfig on the 14th. At the time I thought it might have been Parectopa ononidis, but I wasn't sure and as I never inspected the larva it was forgotten about. Checking again it looks a pretty good match, so any thoughts appreciated...
PS. Paul, apologies if I seem pendantic, but I wonder if your clover might be Zigzag? The leaves look very elongate and parallel - check any wider angle photos you have.
The fly Agromyza nana has a similar mine Barry. You need to check for frass as P.ononidis ejects it and the mine is clean. Will email you more pics of the leaves.
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