But huge swathes of Somerset and Lincolnshire disappear altogether. And there's a comment on the blog about how the map ignores tidal ranges, suggesting that the real areas would be much bigger.

It's interesting zooming in on the maps instead of the sat images to get a better feel for the damage. A street where a friend lives in Penzance is half in the water and half out of it. Imagine what that means in real terms, with rows of crumbling abandoned half-flooded houses all over the country, and the old beachfront areas completely underwater.

And a lot of road and rail links disappear or are badly broken. Not least the Tube in London, although with the City and West End flooded there would be nowhere much to commute to anyway.

It's easy to miss that the destruction will be about a lot more than just lost land area. And it would take a unique and unprecedented engineering effort to protect these important areas all around a coastline.