I stand corrected on the name of the Agency; it is indeed the War Pensions Agency and is a part of DSS.
They do e-mail on:
[email protected]
and they give a url of:
www.dss.gov.uk/wpa/index.htm
Specifically, try this one:
http://www.veteransagency.mod.uk/claim/claiming.htm
Go for it; you've nothing to lose.