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I've been told that this is possibly a Lispe sp. Judging from the photos in the Muscidae gallery, Lispe nana seems to be the only species that has the two pale grey stripes at the front of the thorax. However, there are some British species that aren't present in the gallery. Is it possible to get a species-level ID from these photos? Unfortunately, I only had my phone with me to photograph it, so the resolution is pretty disappointing. Seen today (21/11/2021) near a playing field in Sussex, UK. Any help with the ID would be much appreciated!

Thanks,
Dylan