There were only ever two St Swithun cathedrals, but many churches, big and small. Of English saints, only Thomas Beckett has had more churches dedicated to him.
I provide links to the churches’ website, if there is one. Photos are their own or from Wikimedia Commons – mostly. Please let me know if I am violating your copyright. Also, please let me know about churches or information I may have got wrong or missed.
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Some of these churches traditionally spell their name St Swithin or even St Swithen. Modern scholars prefer the ‘Swithun’ spelling.