Indeed the phenomenon in Sue’s image is a Circumscribed Halo, nice capture but Stan’s image shows the Circumscribed halo as well but the white circle around the zenith is a Parhelic Circle. A full Parhelic circle is not a common phenomenon to witness in the UK usually only a portion is seen when a 22° Halo and Parhelia or Sundog are seen. The rarest, and I think the most spectacular halo to see in the UK, is a Horizontal Arc. Good luck seeing Horizontal arc in all the years I’ve been observing I’ve only ever seen a tiny portion of one. Atmospheric optics expert Les Cowley used to run a comprehensive atmospheric phenomenon website but alas only specific pages of it can be located during an online search.
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