Paul, I am not far from you and also have a house in Belize. Send me a PM if you want to chat and I can let you know about my experiences in Belize over the years and where and why I decided to settle.
Belize is a beautiful country. I couldn't imagine not having ever visited and packing up for the first time as a move. It's very diverse. I haven't spent much time in the southern part, but my most favorite parts were San Ignacio and the Cayes. Good luck. Can't wait to hear how it goes.