Thanks to you both for the info and links. It's interesting isn't it.
Hi David. Good to hear from you again. I have to confess I am not sure what you mean by Sidbury BT images on Family and Family Searches own Indexes - sorry.
Familysearch have a large collection of images of Devon BTs. Those for Sidbury are at
https://www.familysearch.org/ark:/61903/3:1:3QS7-L93K-NFB2 Not all years have survived but they do have, among others, 1713-1717 (starting at image 56) and 1720-1730 (starting at image 72). Also some badly damaged ones without date that probably come between those two periods and from just before.
However, if you search for Sidbury baptisms from that period on Familysearch you will only get results from 1721. The other years have not been indexed yet.
Yes, I muddled the Fardinando Mawditt dates. It is more likely that the one born in 1691 was Ferdinando Blampin's uncle and his father, also Fardinando, the grandfather.
I also misread the date for the Nicholas Blampin at Sidbury. It was 8 Mar 1713/14, the same day as the baptism at Farway. It looks like both records are for the same Nicholas. Either he was actually baptised twice, or perhaps the family lived in one parish but baptised him at the other and the vicar of their home parish decided to record it there as well. (It may well be that the Sidbury PR had an explanation but the vicar didn't bother to copy that into the BT.)
David