Photographed through the glass of the conservatory, hence odd angle.
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Good pictures, but a difficult angle!
There are a few different possibilities for orange-antennaed Scathophaga...inquinata, furcata...etc. All common species. Not easy to run it through the key, as the antennae are not clear, the top of the front femur can't be seen and so on.
My Flickr photos...
Lat/Lng: 52.061168, 1.159024
OS grid ref: TM166450