Monday 26 November 2012 8.13pm
I don't think the Thames barrier is going to fail, we are probably one of the most protected places in the UK, given how close we are to the City of London, parliament, Downing Street, etc.
All of those places have the advantage of being on the north bank where ground is higher than on the south bank which is a flood plain. There is a high flood marker on the side of the Jam Factory which indicates a high flood point in early 1900s. It stands between the upper ground and 1st floors, about 10 feet off the ground. Make of that what you wish........