Hi Malcolm! The last butterfly in this series is not Pyronia tithonus, but Maniola jurtina (female). In Maniola jurtina females, the black dot is sometimes asymmetrical with a second smaller white dot inside as seen here. The black dot in Pyronia tithonus is symmetrical with 2 symmetrical white dots. Pyronia tithonus also has white dots on the hindwing underside as shown in your other pictures.
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Hi Malcolm! The last butterfly in this series is not Pyronia tithonus, but Maniola jurtina (female). In Maniola jurtina females, the black dot is sometimes asymmetrical with a second smaller white dot inside as seen here. The black dot in Pyronia tithonus is symmetrical with 2 symmetrical white dots. Pyronia tithonus also has white dots on the hindwing underside as shown in your other pictures.