Did you sign up for Free BT Sport? If so better check your bill.
I signed up in April, and they have charged me £5 for August. They did this without informing of the change. That is an extra £60 per year. I have now cancelled it. I checked the forums and it has happened to many people, so check your bill if you have BT.
The new BT Sport Europe is £5 a month for BT customers who watch via Sky
As a new BT Sport subscriber I was aware of this, as I read up the blurb when subscribing, but maybe that wasn't obvious to existing customers