Missing tortoise

We haven't seen Speedy since about 2pm yesterday.  We were hoping he'd just turned in slightly earlier than usual, but this morning he's not come out to bask in the sun.  More accurately, I'm sure he's come out to bask and charge his batteries, but he's not doing it anywhere in our garden or next door to it.  It's a mystery how he got out as we thought we had him securely fenced and walled in.  He did manage to break out a couple of times, but I brought him back, figured out how he was doing it - he was climbing up the step by bracing himself against some plant pots.  I moved the plant pots and thought I'd solved it, but clearly there was something else too.

Posters and flyers will go out today, and he has our phone number painted on his shell, so perhaps someone will find him and let us know, or perhaps he'll just bring himself home.  We'll keep hoping, checking the morning sunny spots, and listening for the sound of him crashing through the undergrowth in hot weather, and I'll report him missing with the local vets.  Is there anything else I can do?

Here's the photo from his wanted poster.



Added at 10.15
The farmer let me walk around the fields.  No sign of a tortoise, but I did see a hare...