I don’t particularly care for RP, or traditional BBC. What I do like to hear is “well spoken English”, that basically pronounces each word in its entirety with at least a token gesture at each vowel and consonant, regardless of accent.
For example, anytime I accidentally select a program on iPlayer, that turns out to have been made for BBC3, the dialogue seems to be utterly devoid of consonants. That to me is not an accent, it is just poor speech. It would probably have been corrected in my childhood days by intervention of parents or if parents failed, friends’ parents, or schoolteachers would have advised us of our errors.
Then again, accurate pronunciation is not always as easy as expected, as in the town of Milngavie, near where I was born. Correct pronunciation is “Mull-guy”. There are many other examples in Scotland, and elsewhere in UK.
A valid criticism of many Glaswegian speaking habits, and I am very guilty here, is to speak too fast and omit the space between words. When challenged, I defend myself on the basis that “I speak faster than you, because my brain is faster than yours”. That is rarely challenged, but it may simply be because nobody understands me when I say it.