Geoff pointed out that my slide at the beginning says that the book came out in 2018, whereas it was actually 2019 - but we mention this at the start of the conversation.
Lindsey, G. 2019. 'English After RP - Standard British Pronunciation Today.'
https://www.amazon.co.uk/English-After-RP-Standard-Pronunciation/dp/3030043568
Geoff's CUBE pronunciation dictionary, where you can search for up-to-date transcriptions of modern southeastern British English pronunciation: http://cubedictionary.org/
Geoff's blog: https://www.englishspeechservices.com/blog/the-spooky-ambiguity-of-halloween/
Geoff's YouTube channel: https://www.youtube.com/c/DrGeoffLindsey-speechcoach
His video on phonetic symbols: https://www.youtube.com/watch?v=gtnlGH055TA&t=577s
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My own video on IPA, phones and phonemes: https://www.youtube.com/watch?v=Jx4IObS4rV4