Just been to the shop to see a poster of a found cat, that looks suspiciously like the kitten dd1 lost in October.
I know that kitten, I know it would have stayed outside the house untill it got back in/some one picked it up.
So if it is her kitten it has been lost by someone else aka the person who stole it. It should have been named Houdini. I swear that cat could have escaped from a sealed room.
She still misses her kitten and talks about it daily.