I am trying to find a death certificate but the only entry for Thomas MACKEN in 1850 is for a 6 year old boy, Liverpool.
Thomas MACKEN born 1797 Dublin Ireland. Died London England
Oct 1850. Buried at All Souls Cemetery, Kensal Green, on 23/10/1850. Grave was purchased by Falconer Thomas MACKEN,9 Sussex Pl,Kensington. For the burial of Thomas MACKEN, 66 George St, Euston Sq, St Pancras. Age 53.