Here are some of London's disasters, with some links if you want more information.

Boudicca
eastlondonhistory.com
british archeology
bbc
24 hour museum
wikipedia
world 66

The Black Death
insecta inspecta
bbc
history learning
britain express
history guide
virtual rennaissance

The Plague of London
history learning
university of london
davidCo [?]
concise brittanica
twickenham museum
springfield schools

The Great Fire Of London
anglia campus
luminarium
britain express
london fire
eyewitness history
british council

The Blitz
homefront
eyewitness to history
history place
eduweb
port cities
bbc

There have obviously been many more disasters, both large and small that have befallen England's capital city. I hope to spend more time examining them. You are invited to pursue your own researches; I'm searching for a site which has a good account of the disaster that was Thatcher's Government.