But do they speak 'Estuary'? Somehow I doubt it, as that implies mixing up tenses and persons, replacing 'th' with 'f' (as in free instead of three). I would suggest that they probably speak a more modern version of RP (Received Pronounciation). There's been much in the press recently about how the Queen has changed how she speaks and that the Beeb no longer stick strictly to RP. To my mind, it's just that RP is moderating/modulating slightly.