Just as a (potentially unwelcome) interjection from a former journalist, something is defamatory if it:
Lowers them in the estimation of right-thinking members of the public; and/or
Causes them to be shunned or avoided; and/or
Disparages them in their office, trade or profession; and/or
Exposes them to hatred ridicule or contempt.

(this is from the BBC Academy's definition of defamation)

Your statements, regardless of truth, could be seen as defamatory.

However, there are a number of defences against punishment for defamation. The defence that I assume you would put is that you say the statements are true. However, the legal onus is upon you to prove that they are true. Unlike most law in the UK, in defamation cases, the accused has to prove innocence rather than the accuser proving guilt.

End of sticking my nose in.