Thanks. I've searched whatever I could find online. I'm in the USA now, so visiting Suffolk, sadly is out of the question - I should've started this 10 years ago when I was still in England! Because I'm not familiar with Suffolk (I'm a northerner) the place names aren't familiar, and it's impossible to find a map online with ALL the tiny villages on it at one time.
Mary, grandad's mother, is in the Christening record as baptised in Gosbeck, which seems (I think)nearer to her father's birthplace, Ashbocking, than to her own birthplace, Hemingstone
(civil parish of Stoke by Nayland), registration district of Sudbury, sub reg. district Bures. None of the places are very far apart, by our standards, but in those days even 15 miles would be a long way.
Yes, I think I must accept that I'm not going to be able to solve this mystery, and move on to another, equally frustrating, one. :-)