I know a lot of people don't like them Matt and I do know they can cause havoc (and worse.) Yes they do sound like a human baby. I didn't realise that until I'd moved here (from North London) and heard one. It was nearly midnight so I got up, woke my husband and we went outside with torches convinced someone had abandoned a baby only to find a fox calling for it's mate!!
There is one that lives in the City of London Cemetery that follows me around whilst I take photos there. She lets me feed her, yes I did count all my fingers were still there the first time but she is very gentle (and I am very careful,) I know they do get a bad press so maybe I have only met the nice ones.