while an mp for west surrey, cubitt and his wife lady laura were among the founders and benefactors of st catherine's school in bramley, surrey in 1885. one of the schoolhouses was named in his honour after his death. his wife's gift to the school was a sanatorium, which cared for sick pupils. a stained glassed window in the school chapel, dedicated to st cecilia, was created by cubitt in remembrance of his wife after she died in 1904. the patron of the school is their great-great granddaughter camilla, duchess of cornwall.