Context: Tower blocks began to be built in Great Britain after the Second World War. The first residential tower block, "The Lawn" was constructed in Harlow, Essex in 1951; it is now a Grade II listed building. In many cases tower blocks were seen as a "quick-fix" to cure problems caused by crumbling and unsanitary 19th-century dwellings or to replace buildings destroyed by German aerial bombing. It was argued that towers surrounded by public open space could provide the same population density as the terraced housing and small private gardens they replaced, offering larger rooms and improved views whilst being cheaper to build.

Question: when was the first tower block built in england?
Steam of consciousness below:
To answer this question, we should know that: The first residential tower block, "The Lawn" was constructed in Harlow, Essex in 1951; it is now a Grade II listed building.
So, the answer is 1951.