Just a final update, the machine Bush tyres use in hull is manufactured by john Bean.
I have spoke to john bean direct and they have confirmed what david c said, the rears are toe-in. They told me the specs for my car FOR THE REARS are 0.35-1.00 degrees so according to my calculations that is 2.64mm-7.54mm so as mine are set to 2.5mm, this should be ok. (mine are actually set to -2.5mm but that is just how their machine reads it)
What i dont understand is in the recommended settings in post one, the rears are set to 0.13 degrees and according to my calculations, that is 0.98mm not the standard settings that they are telling me!
I think i am going to leave it as it is as the camber on all 4 wheels is spot on and the front is set to zero so these are as recomended here and im pretty sure the rears are set correctly too or if slightly set to too much toe in but not by much, will this setting eat my tyres and should i get the toe in reduced to a lower figure?
The car feels much better, it still tram-lines but not very much, nothing like it did before and i am putting this down to 8 year old suspension and no work has ever been done on the suspension so i reckon the bushes may be slightly worn out and making it tramline a bit.
My MPG is back to normal now at 36-45mpg depending on length of journey etc.
P.S. this is the link i have been using to calculate degrees to mm and using a setting of 432 diameter for 17" alloys