Hi Clive,
perhaps you could help me out here by checking something for me. On Ancestry.co.uk there is another person Stocking/Johnstone family tree who appears to be related to Callows. He has Ann Kerruish as having died in 1833?, plus the children you mentioned plus a few extra. His tree is open to scrutiny, mine is available under 'Grey' anthonhs@aol.com also open to view. Perhaps you could have a look and tell me what you think?
Kind regards, Debbie.