Been researching tonight. On the St Peters marriages site I found a James Cullen married a Mary Wrigley in 1872. The Manchester's burial search page shows there is a James and Mary Cullen buried together, next to a Harriet Wrigley (I assume she's a relative) in Southern Cemetery. I'm going to find them, the Bostocks and the Lewis' tomorrow.
Will post pics as follows. Can you put photos of graves on here? Might take a snap of me as a detective with my notepad, big camera and torch.
