Wayne
You have been doing all the aggro jobs lately, it seems - and now you want to walk away from what sounds like a lovely job.
If the carpet is stuck to the underlay then it is dimensionally stable, in other words the chances of you shrinking it are slim.
It is most likely a bonded wilton, which has been double-stuck rather than fitted on gripper, as they dont stretch easily.
I've suggested before mate that you need to attend more courses, you can't learn everything from forums.
I'm not trying to be over critical Wayne, but having met your Brother, If you are anything like him then I would like to see you do well in this game.