Leaving a negative trust for someone isn't defamation. You can sue anyone for any reason, but good luck getting a court to hear you.
Actually Vod has more of a case to sue people for defamation who were calling him a pedo etc.
No, but making up stories about people based on zero evidence is. I should add he resides in Canada, which follows similar defamation and libel laws to the UK, which are extremely broadly enforced. When you start attacking nonprofits trying to become tax deductible charities, you start to attract lawyers working probono looking to make a name for themselves in the public eye.