Peter
Thank you for your reply.
I hadn't noticed that the Banns for Clyst St George were missing from the parish collection list. I think that adds more weight to my theory that at some point the parish of Pinhoe has been mistakenly, and confusingly, added as 'Place' to the index.
I did a little more digging and when the bride marries for the second time the marriage takes place at Clyst St George, again both 'of the Parish', but the index lists the place as Pinhoe!
I wish there was an easy way of scrolling back, or jumping pages, on FindMyPast to get to the start of a register to see what it actually says as you can with Ancestry. Fiddling about to try and find the first page by searching just didn't work for me this time

Anyway I am sticking with Banns and Marriage at Clyst St George

Thanks again
Chris