Question Author
Hi,
The leads are supposedly Apple. One I got from the Apple Store but I left it in a hotel and got another from a repair shop that said it was an official Apple one but it never worked properly and when I took it back they plugged it in and it worked fine. Then I got the one back from the hotel but that doesn't work properly now.
It works intermittently if I wiggle it around a bit which makes me think it is the inside connection rather than the lead!!