On Fri, 7 Aug 2015 12:11:51 +0100
Bill wrote:

No-one remembers downloading this film, and they are not aware of
using torrents to download. They have checked their router and they
believe it has the standard default password. An adjacent house is
rented to students.

Any thoughts welcome on what else to think about and what to suggest
they say, politely, in response.

It sounds as though basic defence wasn't implemented, and the students
probably latched on to their WiFi and watched the film. If this is the
case, the owner of the account owes Sky, and they had better beef up
their security A.S.A.P. The chances of proving it was the students is
small. They could try sending them a bill anyway.
If the students found this so easy, they can do a lot more.

--
Davey.