Manori Ravindran International EditorCustomers of streaming service BritBox, which specializes in British content, couldn’t keep calm and carry on after receiving an eye-watering monthly bill nearing $800.Paul Sonnenberg subscribes to BritBox for his teenage daughter, who is “really into British television.” The monthly fee for the BBC and ITV-backed streamer, which launched in the U.S. in 2017, is $6.99 per month.