I live in West Norwood and had a similar experience. A tall black lady, late 30s/early 40s knocked at my door at 12.45am as my house had a light on, she was a local neighbour (she wasn't because I knew the people in the house she said she came from), she wanted ?6 for the meter to boil water to make her 6-year-old son a drink. Either she was casing the joint (as we had had some burglaries a couple of nights before, or she was just trying it on. I said I couldn't help her.