How much electricity does PlusNet router use?

[#1]

Does anyone know roughly how much it would cost me (based on the average price of electricity) if I kept the (white) Plusnet router on 24/7 365? I've got no idea how to work it out.

[#2]

About £10  :D, but +/-50% depending on how your electricity is charged (e.g. primary/secondary unit levels, Economy7 rates, etc)

[#3]

That sounds about right. It would be £10·50 at 10W consumption and a rate of 12p per kilowatt-hour. Allowing for some variation, it's still not much for a year.