Ah! first class, as always Mike! So it would seem that the PP connection is at the discretion of the EVSE manufacturer as to whether the arrangement is in the Charge point or in the plug. This in turn would mean that the leads would not be standard to all charge points. I noted 5 conductors on a single-phase lead from one manufacturer (p,n,e,cp,pp) and 6 on this three-phase one from a different manufacturer (p,p,p,n,e,cp). 

I thought the function of the pp was just to confirm proper contact and the control pilot was the part of the handshake that arranged the level of charge?

Ah! first class, as always Mike! So it would seem that the PP connection is at the discretion of the EVSE manufacturer as to whether the arrangement is in the Charge point or in the plug. This in turn would mean that the leads would not be standard to all charge points. I noted 5 conductors on a single-phase lead from one manufacturer (p,n,e,cp,pp) and 6 on this three-phase one from a different manufacturer (p,p,p,n,e,cp). 

I thought the function of the pp was just to confirm proper contact and the control pilot was the part of the handshake that arranged the level of charge?