This isn't an RP accent, but, Keter, from your point of view it isn't TOO far away from it. Most of the sounds are in fact similar to - or not too different from - Received Pronunciation. If, as you say, you aren't used to British pronunciation at all, then this, I think, is close enough for your purposes.
Did you listen to the clip of the TV broadcaster Jeremy Paxman that I gave you the link for a few days ago? Now HE is a very nice example of RP.
As for the girl in this recording .... I'm going for a long shot here, but I detect a touch of Welsh. Listen to the way she says two syllable words containing 't's, like 'chapter' and 'victim' and 'reaction' The dropped 'g' at the end of 'ing' words is also typical of Welsh pronunciation. Any thoughts?