He practised law in London during the 1650s. Palmer was committed to the Tower again on 9 June 1655 on suspicion of raising forces against Cromwell, but was released the following year.
Palmer worked as a lawyer in London from the 1650s. He was arrested and imprisoned in the Tower once more on June 9, 1655, due to suspicions that he had planned a coup against Cromwell, but was eventually cleared and set free the following year.