btw It's a bit complicated in parts but if you weren't about in 1977 you'll find a good copy of the Guardian article if you google
... able to study the San Serriffe phenomenon in a comparative way and his diary for 1796, now at the Geographical Society at Kensington Gore, contains the first description of the extraordinary scouring and deposition pattern which continually shapes and reshapes the island group.
Worth a read.