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Although it may look like there are five spots, there are two at the 'front' of the wing. The five spot also has two spots there, but at the 'rear' or distal end only has a single spot. The six spot has three pairs of spots.
Thanks Littorella, you've helped my understanding of the difference between the 5 and 6 spots :)
No bother. After I'd clicked the save button I realised that I should have added that I really enjoyed the pics. Quite an impressive sight.
Glad you enjoyed them. Was fascinated by these moths and surprised to see so many on a small plant, ragwort I think?
Lat/Lng: 52.93634, -9.35021
OS grid ref: SE064629
Rough grassland between seashore and a golf course.