Apologies and thanks for the alert - I'd checked out Sansums last night after reading your post but hadn't intended to post any reply. This morning I've been scratching my head re. the apparent disappearance of several posts I've been heavily involved in elsewhere.. This is a very, very senior moment!! Will delete offending items.
Re the Sansums I was puzzled by timing of these baptisms (FindMyPast - transcripts only) -
Sarah Sansom, 22 April 1744, place Avening, parents John and Deborah
John Sansom, 5 Jun 1744, place Dursley, parents John and Deborah
Also, from memory, did I see the name Sansum (bride) married around 1738 at Dursley where both groom and bride were described as "foreigners"?