From Dr Geoff Lindsey.

Old "Received Pronunciation", as represented by the familiar vowel symbols, now sounds very posh and old fashioned. But there are also modern speakers who sound very posh. So what are the differences between old posh and modern posh?

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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