We hired a car and went to Dover today. Up early and back late. A shame the weather wasn't too good and I was disappointed we couldn't see across to France. But a good day nonetheless and we spent 3 hours exploring the castle. At least it didn't rain.
The walls were easily 6feet thick in some places.
It's a shame they can't keep the moat full of water - it would add to the effect of it all.
The sea was very flat today - not often that way. And the ferries were coming in and out very regularly.
The only spoiler was the trip home. Traffic was mostly at a slow crawl for an hour and a half to 2 hours making the trip so much longer.