I don't have any hard information, Gordon, but it sounds distinctly unlikely to me ( a polite way of saying that it sounds like a load of b***s
). It certainly happened in many German cities where the bombing was of course on a vastly greater scale.
I'm sure that
'After The Battle' would have discovered such events if they had happened, and I can't remember seeing anything in their 3 'Blitz' volumes about this.