Hi again Andy
You said earlier - I've also located his death cert from 1853. - and yes, he is also buried in St John Sub Castro together with wife Sophia as follows
Burials in Sub Castro between 1800 and 1993
1955 March 16 James Annie f Late of Lewes 68 Barcombe 407b
1936 January 22 James Charlotte m "The Limes", North St 78 OTP 407b
1828 December 14 James George m infant
1853 August 28 James George m 81 Married St John St Bristol
1862 July 14 James George m 8
1879 February 14 James George m The Union 79
1853 February 15 James Henry m 1.3
1878 May 9 James Henry m The Union 86
1838 July 16 James Henry Fitzroy m 1
1834 July 10 James Louisa f 25
1858 March 15 James Louisa f 0
1876 December 14 James Philip m 71 All Saints 294
1846 March 1 James Robert m Master of the Elephant and Castle 50 OTP
1874 December 16 James Robert m 46
1885 December 10 James Ruth f The Union 71
1832 October 28 James Sarah Jane f infant
1870 May 24 James Sophia f 87
1850 June 23 James Stephen m 13
1868 May 7 James Susan f 23
1916 June 28 James William m The Times, North St 39 Lewes 407
1927 March 9 James William m The Limes, North St 70 Lewes 407
Chris in 1066