I've reported it to RSPCA but they said that unfortunately without lack of specific details about where it is they cannot investigate further. I have not heard it this morning. I checked in some of the bins last night as sometimes it sounded further away (slightly muffled) and other times really clear. At a guess it sounded like it was coming from the area behind the car park and near that shed that L&Q use. If I see the caretakers I will mention it to them in case its locked in their lock up.