Beauttah led the Kikuyu Central Association, Kenya's first all-African political organization, together with Joseph Kang'ethe.
When the KCA wrote to Beauttah and asked him to travel to London as their representative, he declined, but recommended that Kenyatta—who had a good command of the English language—go in his place.
In 1929, the Kikuyu Central Association decided to send Jomo Kenyatta to Britain to present African grievances before the Colonial office.
On 24 September 1930 Kenyatta returned to Kenya; he and his wife Grace Wahu reached Mombasa where they were welcomed by Beauttah.
Together with other prominent Kenyans including Peter Mbiu Koinange, James Gichuru, Albert Owino, Joseph Kathithi, Tom Mbotela, Harry Nangurai, Fred Kubai, Jesse Kariuki, Francis Khamasi and Ambrose Ofafa in 1944 they formed Kenya African Study Union (KASU) which later was renamed Kenya African Union (KAU).