Didn't think a 2.6 had an EGR valve 
found a unit on drivers side that is on a flexible mount and has water pipes going into it, the leccy connector was off , do you know what this unit is
Is it fixed to a bracket that is fixed to the inner wing, if so its part of the winter pack for the heater 
yes thats the one thanks ,so its not that thats causing my problem. thinking about it my screen heater hasnt been getting very hot , perhaps thats what was causing that
Winter pack helps the heater matrix get hot water quicker, if anything screen heater should be hotter than normal, Jimbob made a guide for flushing the heater matrix 
thanks for that but if 2.6 doesnt have an egr valve where do i go next
I was thinking of my 2.2 and other V6's when thinking EGR, my mistake 
When it cuts out, does it run rough, then die? or simply cut out cleanly?
yes it goes lumpy as if fuel is not getting through
Does it always do it? Does it drive fine for hours, but then cut out, or always lumpy on startup, then die?
Worth checking the fuel filter, drivers side i think, small cylinder object, up by the petrol tank, should be changed every couple of years, that could be blocked.