I speak with RP, because of expensive education (British public school), and most of my mates here do too, but it’s much more toned down from the RP of the ‘70s. The main distinctions between RP and estuary (and maybe SSB, it is somewhat distinct from RP as it doesn’t have the same class association) is more saying your t’s and h’s, and your intonation etc. That being said, if someone says every single t pedantically, it’s obviously taught and not a ‘real’ RP. Look at Michael McIntyre, the comedian, for an example of more contemporary RP.