Hopefully we've "cat proofed" downstairs garden, with the aid of a child safety gate across one exit and by blocking up a favourite escape route round the side of the house with stones etc - we then left the front door open and, eventually, Bobbie came down stairs and made a bolt for freedom. He went straight up to the safety gate (access to "top" garden) and couldn't get through the gate, although he did do the tiger in a cage thing of going up to one of the gate, trying to get through, couldn't, go to the other end of the gate, try to get out, couldn't - repeat
Then he disappeared into the general garden foliage - good thing is, he hasn't eaten so far today so hopefully he won't be going too far and will come in tonight for tea