I see a George COKER convicted at CCC in 1839 arriving at Port Arthur on the Runnymede in 1840. However, his sentence was listed as life. He is also listed as receiving a third class pass in 1846 and a ticket of leave in 1849. there's a record of a George COKER marrying a Bridget FOY in 1856 and dying in Tasmania in 1881. They are reported to have 2 children George b 1859 and Elizabeth b 1861. I can't find supporting evidence for this though.