It's not the best photo but look carefully and you should see a flat rainbow in the middle of the picture. I spotted it just after midday when the mist and rain had rolled into the valley below.
I don't think it's a circumhorizontal arc because the clouds were low-lying and thick rather than high cirrus clouds. It's not a fogbow either because it doesn't arch and it's coloured. I shall have to keep searching to find out what the name is for this optical phenomenon.
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