Thankyou all for taking the time to reply! In reply to Trisven13, he literally turned up on our balcony a few nights in a row and started to sleep there. We found the owners and they asked if we wanted him and didn't want to discuss him any further. Shame really, although he ended up enjoying a wonderful life. I was only young when we inherited him, now wishing I'd done a little more research into his history.
Thanks again everyone, I'll be sure to post pics of our new family member when he/she arrives :)