Shell Mex House is located at 80 Strand, London. It was built in 1931 and was the headquarters of Shell-Mex and BP Ltd, a joint-venture company started by Shell and British Petroleum to unite their marketing efforts in the UK.
During the Second World War, the Ministry of Supply set up operations there, though the building was badly damaged by a bomb in 1940.
In 1948, Shell-Mex and BP Ltd resumed business there, until the companies separated in 1975. Shell worked there alone until 1990.
The building now houses Pearson PLC, which owns Penguin Books.