The above vowels are only a few ways in which Claire Foy changes her accent to sound more like the Queen. You’ll spot other interesting features if you listen carefully!
If you have any thoughts, then please comment underneath. Otherwise, why not spend some time exploring the vowels of SSBE on my interactive vowel chart.
1 a biopic is biographical film. The standard pronunciation is /ˈbʌɪəʊ pɪk/ “BIO-pic”, but lots of people say /bʌɪˈɒpɪk/ “bi-OP-ic”.
2 SSBE stands for the Standard Southern British English accent. It is a contemporary “standard” accent, also known as a modern version of RP.
If you are particularly interested in the Queen’s speech, you might want to take a look at how the Queen’s accent has changed over time in this journal article: Monophthongal vowel changes in Received Pronunciation: an acoustic analysis of the Queen’s Christmas broadcasts by Jonathan Harrington et al. (2000, Journal of the International Phonetic Association 30: 63-78).