Potential home found. A girl I know has a friend who's cat went walkabouts a while ago and never came home. Her little boy (not a toddler, so old enough to know how to treat a cat) is really upset and misses his cat immensely. I've forwarded the contact email address and will know if she'd be happy to take on this bonded pair in the next couple of days.
I also asked if I'd be allowed to pop round to see how Charlie and Poppy settled in if she took them on.