Andymog 57 -- My Plus four was produced before the change to USB sockets so I have a lighter socket to which I can plug an adaptor with USB sockets for the sat nav etc.!!
Cheers!
I would have preferred a hella socket as I use hella to USB adaptors on my motorcycles and have them at hand. Nevertheless, 2 x USB sockets are also welcome, I use one to power my mobile telephone and use that in turn as a satnav.