Thanks guys,
Just to update. I have spoken to the guy at the third garage. He advised the replacement of the EGR valve. When I explained to him this had already been done (I did explain when I dropped the car off but seems lack of communication) he said he needed to have another look at the car. So back in it goes on the 24th May. In the meantime am driving it with the lights on. no doubt it will require yet another DPF clean by the time it goes in to get looked at.