Rats are getting very very bold these days. They are very intelligent and have good memories. They have twigged that they have no reason to fear people.
In my part of North London the council will no longer deal with them - you have to pay a private company. Hence the massive increase in the local rat population. They used to be nocturnal creatures, now I see them running through peoples' gardens on my way to work in the morning.
It is extremely worrying, when you think of the diseases they carry.