This can be used a as a tool for actors who have roles that requires them speaking with a RP accent. This could be a very useful tool for actors who do not have a dialogue coach.
The resources here are mainly bits of dialogue and vocab for the user to repeat and practice saying with the RP accent. They also get down to the specifics of the sound with how to make each one of the sounds based on the type of sound and the placement in the mouth.
This shows that actually learning an accent that is not your own, takes time. Some dialects have sounds that aren't in others. So, when learning the new dialect, one needs to get down to the specifics on how to make each sound. It tales many hours of practice to achieve a convincing "natural" sounding accent.