Final answer:
The social reform movement in 1840s Britain aimed at improving working conditions and addressing social issues was the Chartist Movement.
Step-by-step explanation:
The social reform movement in 1840s Britain aimed at improving working conditions and addressing social issues was the Chartist Movement. The Chartist Movement sought to achieve political and social reforms, including universal male suffrage, annual elections for Parliament, salaries for members of Parliament, and secret ballot voting. The movement gained support from a wide range of workers and was an important step towards the development of democracy in Britain.