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Old link style
https://www.wellscityharriers.org.uk/70-uncategorised/1218-street-5k-race-2-november
New link style
https://www.wellscityharriers.org.uk/index.php?view=article&id=1218:street-5k-race-2-november&catid=70
...so you need to change the structure to
https://www.wellscityharriers.org.uk/index.php?view-article&id=articlenumber:name-of-article&catid=70
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