Hi Ben,
You are right there are great locations but many of them are hidden! However, a couple of ideas: have you tried Creative England? They have a couple of designated people for the Easter region- www. Creativeengland. co. uk. They also have a locations and crew database I think.
Norwich and Suffolk councils I think have pages on their. Main sites
That deal with filming applications.
Also, Suffolk has just created its own film organisation. The guy who runs it is called Julien Mery: tel- 07716. 803081. He might be able to point you in the right direction.
Finally there used be a locations agency/ manager – Film East. Try googling and his details will appear. He might also be able to help.
Do come back to me if I can help further.
Sue Hayes