I've just found the baptism of a Robert Bristow, son of Robert Bristow, 8 Jun 1735 at Steep, Hampshire. I suppose he could be mine rather than the Buckland one, but I can't see anything else on the Steep people at the moment.
(Edit - I wonder where I found this?)
Further edit - the surname looks more like Burrow or Barrow and there is another baptism on a later page where the surname is definitely Burrow or Barrow. So we can rule this out.
https://www.ancestry.co.uk/imageview...cklabel=Return