Misr Island

Misr Island is the location of Misr House, and is Edward Gavigan's country estate, just outside Walton on the Naze, Essex. It can easily be reached from London by car - approximately 80 miles, here's the route). But bear in mind that 1920s road conditions mean that even averaging 30mph is unlikely.

There are 1920s photos of Walton on the Naze in Putman's Old Walton Archive.