Evacuation to a height of over one hundred fifty feet above sea level for London would be to areas of Hampstead in the north, Shooters Hill to the southeast, Biggin Hill to the south, and Richmond Hill to the southwest, all with sea levels double the height of the Thames Barrier, and all within five miles of the Thames. Assuming people casually walk three miles per hour, evacuation by foot would be less than two hours.
U.K. rock band Fightstar used clips from this movie for their music video, 'Floods'. The band had set the release date, but had to change it because of the real floods hitting the U.K.
The flood that is mentioned in this movie was similar to the North Sea flood of 1953.
London has a lot of hills: Parliament Hill, Muswell Hill, Forest Hill, Denmark Hill, Primrose Hill, Shooters Hill, Brixton Hill, Cornhill, Herne Hill, and Tower Hill all within a few miles of the Thames, with heights ranging from one hundred feet and four hundred fifty feet above sea level.