Many years ago we did Ozzy Osborn's house in Buckinghamshire, they were having the hall carpet replaced which was a Hugh Mackay beautiful light green supreme velvet, huge thing. than ran up 3 flights in very good condition, some of it had hardly been walked on.
They said if we could move it we could have it,

we did the whole house in this top quality carpet which would have run in to thousands if we had bought it in new.
I would have to say its biggest (in more ways than one) tip I have ever had.