Please don't jump to conclusions. Many of our cats have gone for "a walk about", but they return. Since you just moved he may not be able to find his way back home. Put some food out on the patio and put something out that smells like him (like his favorite blanket). He may just need a hand finding his way back to you.

We will keep all of our fingers and paws crossed that Mr. Stuart will safely find his way back to you