I haven't seen any such middle class / educated folks become JWs in recent years. However, I have seen several such families exit - health professional; geologist; accountant. Also mothers and victims of BoE bullying (via "shepherding visits" but more like the "kiss of death" as one elder used to say).
The recent declaration of the British Charity Commission's labeling the Watchtower Society of Britain's attempted obstruction of investigation as "unprecedented", is leading others to see how really loving "the society is"! The Watchtower Society of Britain has created a relatively safe pretext for departure (WT response to child abuse issue). Several in my congregation have departed since the Charity Commission's declaration. The BoE dare not respond punitively to this rationale for departure. Thus, the luminaries in the Britain Branch (Gillies, Papps et al) may have shot themselves in the foot! I picture them in my mind as demon possessed swine who will hopefully jump over a cliff!