We're moving house in a few weeks, and I'm worried about our cat getting confused/upset 
We're moving literally 20 yards; across the road and down a bit. He'll still be pretty much on top of his current 'patch' (we are quite countrified, house adjoins fields of cows and a bowling green) but will have to find his way to it by crossing unfamiliar territory.
I'm worried that he'll just go back to the old house and be confused when it's not us living in it/the flap is blocked up. Also, our buyers are allergic to cats!
Any advice gratefully received