[St Charles Owl]

For 1mm difference (new tyres are 8mm) it's hardly worth swapping the new ones to the back. Assuming FWD those on the back will last for ages. Why are you talking about new ones if they still have 7mm? 3mm is the point at which you should be replacing.

It's called OCD Oval   the wifes, not mine 

and there's another bloody scam   new tyres used to be 10mm and that's what I was working on with the rears 

How many miles do you get out of tires in the UK?  I get about 50k out of mine over here.