Hi Grantley,
I've visited Whittlesey St Mary church. I was looking for gravestones, which had all been removed and stacked around the church boundary unfortunately. Unfirtunately, I didn't think to gain access to the interior as it didn't cross my mind that the Haynes family would have their own family vault.
Would there be any chance of getting hold of the photographs? If not, would it be possible to get further info on who you got them from?
Regards,
Mark Haynes.