I have noticed that in many movies and TV films English-speakers with a very sophisticated "posh" British accent roll their r's if before a vowel. This is very dominant in older productions, in younger productions, say since the 80ies, where pronunciation is intended to be more "realistic" r rolling occurs occasionally, especially when the occasion is very formal or in parody. I am not aware if r olling is a dialect feature somewhere in South East England but apperently it used to be some standard in actors' pronunciation.
I am very interesting in this rolled r want to learn to pronounce it. Unfortunately I can't fidn any information baout it whatsoever.
Can anyone give me a hint?