The Deepings etc. and other parts of south Holland will have Peterborough as the post town historically.Early censuses probably contained some of these villages with Peterborough. Even today. Boston Lincs has PE21 postcodes and is 30 miles from Peterborough. At least the 1974 local government reorganization tidied things up for administrative purposes, though if Peterborough continues to grow the same thing may happen again.