The Prime Minister may be an astute politician as they article says but he is certainly not biblically astute and should test the spirits as the Bible warns as it is just babbling with no interpreter as the Bible advises. The gift of tongues was solely given to speak the language of the foreigner to proclaim the Gospel.
The History of Tongues
https://amazingdiscoveries.org/S-deception-speaking-in-tongues_history_practice?_escaped_fragment_=
1 Corinthians 14: Dealing with Tongues
https://amazingdiscoveries.org/S-deception-Corinthians_gift-of-tongues_Paul_Church
The History of Tongues: Recent History
https://amazingdiscoveries.org/S-deception-tongues_languages_Joseph-Smith_Irving#!
Spring 2013: Seeking After a Sign – Part 2
https://amazingdiscoveries.org/AD-magazine-archive-Spring-2013-Tongues-HolySpirit
Understanding Tongues
https://www.amazingfacts.org/media-library/book/e/84/t/understanding-tongues