Does legal advice privilege extend to foreign non-regulated or non-registered in-house lawyers? (Ashley Pratt writes for Practical Law's Dispute Resolution Blog)

In 1859, the then Vice Chancellor Sir Richard Kindersley held in Lawrence v Campbell that:

"…The general principle is founded upon this, that the exigencies of mankind require that in matters of business, which may lead to litigation, men should be enabled to communicate freely with their professional advisers, and their communications should be held confidential and sacred, and that no one should have a right to their production."

Does such a right to legal advice privilege extend to foreign lawyers, and if so, to in-house foreign lawyers that are neither said to be registered or regulated in their own jurisdiction?

Ashley Pratt discusses for Practical Law's Dispute Resolution Blog. You can read his full article here.