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I visited Hazelbury Common today looking for chalk hill blues. There was a guy there logging species who said there were a couple of dark green fritillaries near the bottom of the common. I eventually spotted one but couldn't pin it down for a photo, then I saw another fritillary-like butterfly that was substantially smaller, about meadow brown in size, and nope, no photo here either as I lost sight of it when it flew over a hedge into a cow pasture. Any suggestions as to what it might be? There seemed to be a row of whitish spots at the bottom of each rear wing. The rest was a frit-like brown and black mottling.
Other sightings posted in the requisite forum.

Having now been to the Velvet Bottom reserve as recommended by Markatbath and seen lots of dark green fritillaries I now realise that they aren't as big as I initially thought they were. So my mysterious sighting at Hazelbury was a dark green frit.

Could it not have been a comma? The form that emerge earlier have more rounded wings.

Thanks for the comment Wayne but it wasn't a comma. I have loads of commas at my local patch. The following day I got a picture of the underside and there's no way of confusing the two there.