alleging defamation in a UK court
<p>The term ‘defamation’ describes an untrue statement that’s been presented as fact and causes harm to the character of the person it describes. If someone’s reputation is damaged because of a false statement, this statement will be considered defamatory.</p>
<p>Should an opinion be considered an accusation, and be untrue, this still defames the person in question.</p>
<p>Does this mean that if A alleges B defamed him, if a judge decides that A is wrong, does that mean A has defamed B?</p>

<blockquote>
<p>The term &quot;defamation&quot; describes an untrue statement that’s been presented as fact and causes harm to the character of the person it describes.</p>
</blockquote>
<p>In some jurisdictions an admittedly true statement can still be defamatory. See <a href="https://law.stackexchange.com/questions/74710/can-true-statements-or-statements-of-opnion-be-libel-or-defamation-in-any-countr">Can true statements or statements of opnion be libel or defamation in any country?</a></p>
<p>If A claimed that B defamed A, but a court rules that there was no defamation, this <strong>might</strong> make A's statement legally false. But it will not be defamatory unless it also harms B's reputation.  Statements made in court, and in legal filings, have <a href="https://www.law.cornell.edu/wex/absolute_privilege" rel="nofollow noreferrer">absolute privilege</a> and may not the be basis of a defamation action. Public statements by A accusing B of defamation might be the basis of such an action.</p>

united-kingdom defamation