Comcast lost 33,000 pay TV subscribers in Q4 2017, reducing its total video customer base to 21.3 million and bringing net video losses for the year to 151,000, although the operator says video revenue increasing by 1.5% to $5.7 billion in the fourth quarter helped offset losses. It also gained 350,000 new internet subscribers in the quarter to reach just under 25.9 million. X1 licensing agreements contributed to revenue growth in Comcast’s Other sector of 2.3% to $693 million. It said that Xfinity mobile now has 380,000 customers, up from 250,000 last quarter. UK operator Sky gained 380,000 new subscribers on TV and mobile services in the UK, Ireland, Germany and Austria in the second half of 2017, to offset…