Mitchell, the son of a Jamaica planter turned London merchant, was educated with five younger brothers at Westminster. Whereas his surviving brothers went into trade, John read for the bar and is probably the John Mitchell who had chambers at 3, Old Square, Lincoln’s Inn between 1809 and 1816. He disappeared from the Law List after 1817.
In February 1818 he considered but eventually rejected the idea, put to him by his friend Alexander Cray Grant, that he should stand for Grimsby in harness with Charles Tennyson.
Mitchell, already a wealthy man, inherited extensive and lucrative Jamaican estates and sugar plantations on the death of his uncle William Mitchell in 1823. He died at Torquay, 29 Aug. 1859, aged 77.
