Not that it takes much to confuse me, but this one I just can't seem to pin down. My first thought is "Azure", but the markings don't seem right.
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I thought you would know. It was that odd-looking mark on S2 that just didn't look right. I'm good at talking myself out of an identification...
Lat/Lng: 52.4515, -0.1889
OS grid ref: TL231852