Possible rarely recorded fly in Little Hadham

Back at the beginning of December, I potted one of several flies I found hibernating in the cracks of the bark of a large oak tree. This was close to the portable moth trap I was emptying one evening. They looked unusual, showing yellow on the wings and with a striking yellow marking on the face.
I wrote to the Diptera County Recorder, Malcolm Aldridge, describing my find and have received a letter this morning, requesting photos to confirm identification. He also kindly forwarded the Herts records of this insect. Found at several sites but only on 7 occasions, with the last record being submitted in the Summer of 1994. If it is Mesembrina meridiana, then a good record for Herts.
Couple of photos here. I await confirmation and also for Mr Aldridge to remind me where I found them as I have lost the post it note on which I wrote date and site!! Poor recording on my behalf.