On 5 May 1868, Thomas returned to England, where he travelled extensively giving lecturers about the Gospel message and meeting with Christadelphians in England. During this period of his life he found extensive support and help from Robert Roberts who had been converted during a previous visit to England by Thomas. Following his return to America, he made one final tour of the Christadelphian congregations prior to his death on 5 March 1871 in Jersey City. He was buried in the Green-Wood Cemetery, Brooklyn, New York.