Benjamin and his wife Amelia married in 1859 and were members of the Baptist Westbourne Grove Church in Bayswater, London, where they lived.

It was pastored by their friend, William Garrett Lewis, who was instrumental to Hudson Taylor publishing China's Spiritual Need and Claims.

Benjamin addressed breakfast gatherings in the homes of titled people and spoke for the mission at meetings throughout Britain.

In 1888 Broomhall formed and became Secretary of the Christian Union for the Severance of the British Empire with the Opium Traffic and editor of its periodical, "National Righteousness".

When Broomhall was dying, his son Marshall read to him from The Times the welcome news that an agreement had been signed ensuring the end of the opium trade within two years.