Section 184 of the Canadian Criminal Code and Foreign Actors
As a general rule, Canadian law cannot shield you from being subject to laws of another sovereign country; but
- the ability of the foreign country to enforce its laws in Canada is limited: it is against the international norm and considered an infringement of Canadian sovereignty to take enforcement actions without consent of Canada;
- the foreign country's law may provide a defence if the action in question is required or allowed by another country's law: here the defence ultimately is provided by the foreign law, not the Canadian law, even though the foreign law refers to the laws of other countries.
(as I understand it, recording without consent of others is usually illegal in the UK).
Recording a conversation by an involved party is generally not illegal in the UK, although sharing or usage of such recording for certain purposes can be illegal.
Let's say you did record a conversation with someone in an all-party consent jurisdiction (say, Atlantis) though:
would Person A have to face legal consequences?
They could face legal consequences in Atlantis, as the laws of Atlantis may provide criminally and civilly.
The legal consequences may or may not have an important effect on you. Even if Canada does not enforce a foreign judgement or accept a request for judicial assistance, the foreign authority is sovereign in their own jurisdiction, just like Canadian government is in Canada. For example, if you receive an income from a source in Atlantis, Atlantis could order the source to stop sending you any money or intercept the transfer.
believes that the company they are both in is conducting unethical acts
Atlantis law may or may not provide for protection for whistleblowers and who qualifies as a whistleblower.
(or even extradition)
Canada, like most countries, requires double criminality for extradition. That is, Canada will only extradite a person to a foreign country if the action in question is an offence both in Canada and in the foreign country. So you cannot be extradited from Canada if you do not violate Canadian law.
This does not apply, of course, if you travel outside Canada.
civil lawsuits/judgements.
Canadian courts is likely to refrain from enforcing a civil judgement resulting from one-party consent recording alone for public policy reasons. In particular, it is unlikely that non-penal damages would result from the action of recording alone. The sharing of the recording to third parties or other usages can complicate the situation.
The Criminal Code simply does not make recording a conversation in which you are involved a criminal offence, it does not shield you from civil liabilities, even in Canada.