Online HER for Essex. Unfortunately, the interactive mapping proudly declared in the introduction to this website, doesn’t work, and hasn’t done since 2015. The rest of the site seems to function well.
Peterborough’s system allows the HER to be searched using keywords, and retrund fairly detailed resultl. Unfortunately, the “GIS” part of the site only offers a map, with no sites mapped and no interactivity.
Whilst presented as Suffolk Heritage Explorer, the GIS element actually allows searching of both Suffolk Norfolk. The mapping could be bigger, but a very useful system nonetheles.
At the time of writing, Bedford, Cambridgeshire, Central Bedfordshire and Luton, Colchester, Essex, Hertfordshire, Norfolk, Peterborough, Southend, Suffolk HERs are all available to consult via Heritage Gateway