Yes, day 5 has a part 3. After leaving Dungeness in the fading light I subjected my family to a long and involved search for the famous sound mirrors or "listening ears" at Denge. Built in the 1920s they were early experiments in radar.
Access to them is now completely closed off, except by guided walk organised by the Romney Marsh Countryside Project. I'd contacted them to see if there was any way of arranging something, but the short answer was no. The land they sit on has been turned into an island and stabilised to protect the structures, but I figured there might be a point somewhere with a decent view.
Considering that they're pretty huge (the large one is 200 feet across) they're remarkably elusive and we couldn't figure out where they actually were. I'm sure there are some holes in the space-time continuum around that area, and it seemed like they kept appearing and disappearing. So we drove up every street in New Romney and then after a long crunch over the shingle this is as close as I could get.
If you fancy getting closer the next walk is on 19 July. And that's it for day 5, promise.