Thank you AVM228, I had been thinking that there may be a reason like that for the anomaly over Manley's date of birth. It may also explain another similar instance elsewhere.
I am very doubtful about Hester's date of birth, in fact I left it blank on the family tree when I first discovered her, yet there is no other record. They did in fact have 3 more sons which seems odd.
Hester has become someone I am really intrigued by, it has been mentioned that she was from Charlecote which as I am sure you know is "stately home" fairly close by, yet I can find no record of this. The impression I gain is that both families were reasonably well off, the Ashwins at the time were probably yeoman farmers.