In this report, we examine the completion rates of every scripted series since 2018 across all the major UK broadcast channels.

Comparing scripted programmes across different channels by overall viewing is difficult as these numbers are affected by promotion, prominence, competition, the quality of online player UIs and availability.

The rate that series are completed—viewing of the final episode as a proportion of the first episode—eliminates these and allows comparison.

With c.22m accounts across 44m devices, Roku has a US footprint which exceeds the largest pay-TV platforms

Limited competitive advantages highlight the scale of this achievement, but also leave the pioneering firm vulnerable to activities from bigger, wealthier rivals Apple, Amazon, and Google as well as pay-TV providers

The odds are stacked against Roku, but continuing the innovation in production and product that built its lead may secure future success