There's a bloke who lives a few doors down who I am almost certain is up to some sort of dodgy activity.
Despite there only being two people in the house, there are regularly 3 or 4 cars outside his (and everybody else's) house. These cars seem to be replaced every week or so by different cars, but then after a few weeks the cars reappear.
Currently its a Renault Laguna (which hasn't been seen for a while), a Peugeot 206 and a Mazda MX-5. Other regular visitors include a Toyota MR-2 and a Land Rover.
So, does anybody else have neighbours who appear to engage in spurious activities?