This could be a bit of a weird one, as I'm not completely sure this cat is lost (!), but I'm just checking to ensure it's ok...

We live over on Wyleu Street, and a big black cat (unfortunately no photos, but it looks quite stocky), has often been found in/around nearby gardens loudly crying at night. It's tried to get into our cat flap twice in the last 24 hours (actually, the first time it succeeded, and I got a bit confused when I woke up to find a black cat strutting into our bedroom!) Our two cats have so far chased it off, but I'm not sure if the cat is lost, confused, or just very brave?