The wifes is going back with her Dad in the morning to get some pics. I've told her to take a ruler or something so indicate the size and depth aswell.
On top of all that the tyre place said the rears are worn to the limit - they do look to be wearing on the puter edge but it's only done 13000 miles. They guy said this was about right but seems a bit low for rears to me. The front has more tread left than the back. He then said it's because the suspension is raised. Admittedly it does look a little high but it's been like that since new.