I had a Cousin Isaac Appleyard b1822, who was serving his sentence of 7 years for stealing boots {3rd offence} in Millbank Prison, London.
He was convicted at Leeds Sessions in 1848 & sent to Millbank Prison & then he was sent to Shorncliffe Convict Station on 26th Feb 1850 as a result of Cholera epidemic in London,
So he is on the 1851 Census along with a lot of names of other convicts