Church Fabric Survey database
2013
Sources for Heydon: Holy Trinity
CWGC
Commonwealth War Graves Commission
2016
Cathedral and Church Buildings Division
Research into the Presence of Bats in Churches
2014
Robert Edwards
Exterior image of 608574 Holy Trinity, Heydon
2009, July 20
John Salmon
Interior image of 608574 Holy Trinity, Heydon
2011, January 20
Church Buildings Council
Church Bells
2019
Church of England
A Church Near You
2021
ICBS
Incorporated Church Building Society Archive
1817-1989