From Dr Geoff Lindsey.

What are the differences between old posh and modern posh British accents?

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0:00 Mystery vowels and introduction
1:39 The four quadrants of the vowel space
2:15 FLEECE, KIT, LOT, PALM
3:49 GOOSE
5:14 FACE, happY
6:11 TRAP
7:58 Torn DRESS
8:57 PRICE
10:18 GOAT, MOUTH
12:32 STRUT, NURSE, SQUARE
13:47 Chain shifts
15:51 Advanced RP?
16:51 /t/, glottalling & spirantization
18:23 Those vowels