Canon UK replied to my email concerning dead pixels.
'In reference to your email I understand you were received 2 EOS 700D which had a dead pixel using a long exposure. If it is the LCD screen which has a dead pixel that could indeed be the case. Allthough the lcd monitor is precise manufactured there may be a few dead pixels.
If you have imported the images onto your computer and they are showing dead pixels then the camera needs to be send in for service.
Once again, thank you for contacting Canon. We trust this information is of use to you. Should you have any further questions, please do not hesitate to contact again.'
I guess the guy was not a UK rep, as his reply was a little bit awkward. But he clearly says send in the camera if I am seeing dead pixels.
I have had 4 700d bodies. All 4 have had pixel issues. My previous 1000d and 600d were fine. So my conclusion is that canon are shipping dodgy sensors or I am very unlucky.
There's quite a lattitude for sensor QA, I've had cameras with or without dead pixels over the years. It's a little bit like lenses...try before you buy. There's always a small difference between every lens and camera.
I have apair of 5DIII's and one has a few long exposure dead pixels...it's happens and it's really no biggie.