A defendant (or in the case of a counterclaim, the claimant) who alleges that —
(a) in so far as the words complained of consist of statements of facts, they are true in substance and in fact; and
(b) in so far as they consist of expressions of opinion, they are fair comment on a matter of public interest; or
(c) pleads to like effect; must give particulars stating —
(i) which of the words complained of are alleged to be statements of fact, and
(ii) the facts and matters relied on in support of the allegation that the words are true.