The East End of London is the historic center of East London, which is larger. The area is located east of the medieval walls of the City of London and north of the River Thames, with no formal borders to the north and east. The area was known for its overcrowding and poverty, which led to political activism and attention from social reformers. In the Industrial Revolution, many factories chose to set up in the East End since the wind travelled from west to east, thus keeping the smells from the factories out of the city. This was one of the many reasons why the East End was home to much of London's lower class. 

In The Remains of the Day, Stevens mentions Mrs Barnet, who took Lord Darlington to the East End. 

"And it was Mrs Barnet, as I recall, who took his lordship on those 'guided inspections' of the poorest areas of London's East End, during which his lordship visited the actual homes of many of the families suffering the desperate plight of those years." (pg 145-146)