OP you can check out the national archives list of resources here [1], there is a section on tracing a person by name.
[0] https://www.theguardian.com/artanddesign/jonathanjonesblog/2...
[1] https://www.nationalarchives.gov.uk/help-with-your-research/...
In what way is it possible he isn't?
Um? Any evidence to say he's not dead?