The questions (all reasonable IMHO) still stand:

- Were those who were spreading these rumours knowledgeable?
- Were those spreading the rumous credible?
- What did they do? Did they work for the Haig Fund, the Haig Charitable Housing Trust or the Royal British Legion?

Additional question - what on earth led you to believe that they had access to the financial records of any of the following:

- The Haig Fund
- The Haig Charitable Housing Trust
- The Royal British Legion
- The personal banking transactions of Haig or any member of his family

Because unless they had then the source of the baseless rumour-mongering was probably just good old plain tooth-sucking envy as your father was ex-RN he'd know the meaning of the phrase. Nothing at all so despicable as besmirching someone who is unable to defend themselves.