Hi Ken,
Many, many thanks for your interesting and helpful reply.
Anderson Marsh (born 18 May 1822 and lived in Cambridge) enlisted in The 15th Hussars sometime between 1841 and 1844 when he sailed for Bangalore. Was this the Sikh Wars?
From all the info I've gleaned so far he never married or had a family, so really I was just after his service record ie where he enlisted, where he served etc.
Many thanks for the Kew link and 2011 info. The British Medal Forum also sounds a good bet - will try that.
He was in Addenbrooks Hospital, Cambridge, when he committed suicide in 1871 so, yes, he could have had a disability. Thanks for the interesting pension info.
Re Dublin in 1861, do you think it was feasible that he was in the services for 20 years? As that could be a good bet as to his whereabouts if it was.
Thanks again for taking the time and bother,
Jill