I'm chuffed. John Wells wrote me an email.
I was looking for a video series designed symbol-by-symbol on the RP version of English. This is apparently just what Alex Bellem has done through the BBC's Learning English site. She's great and occasionally fun. The videos are short and easy. This is a link to the beginning with a full chart which corresponds to the symbols found in student books and dictionaries.
This is recommended for students at Pre-Intermediate levels or higher. Better Elementary students with an awareness of pronunciation issues may also benefit from these as reminders of similar sounds like the Hot vowel, the Four vowel and the Up vowel.