(05 Apr 2016, 7:25 pm)South Tyne Lad wrote At quite a expensive price too I imagine! What happens when Sockets are fitted? More wiring?
I'm no sparky, but I'd imagine more wiring would be required, yep.
A cheaper alternative is to fit USB power sockets in between seats, or to the back of seats. Arriva have started to fit them to the backs of seats on their MAX refurbs, but I understand these aren't half as effective as the normal power sockets (in terms of charging).