still got his clubs
3 courses of action here, first a personal visit un-announced with a dictaphone (what I did in another life..then merrily played it back to the concerned individual), and if the reference is not forthcoming...seek legal advice.
Option 2 contact your tax office, your P45 MUST be issued when you end your employment..if not they are breach or about 10 tax laws....
Option 3 a personal referee who will provide an written statement