Thanks Bernard, 
I didn't intend to add a building part. It's really quite difficult to find the entity for the whole building, but I have now done so, and have corrected the postcode, which is PE1 1XB. 
It would be helpful if the church name were just "St John's Church" as that is the name the church is generally using, and referring to it as "St John the Baptist" causes people to think it a Baptist  church, when it's actually an Anglican one.