I don't have an Apple TV, and one reason is because iPlayer doesn't support subtitles. The BBC continues to give endless prevaricatory excuses why
not:
https://www.whatdotheyknow.com/request/accessibility_technical_challeng
It turns out somebody got fed up enough to make their own iPlayer app that includes subtitles:
https://github.com/alexbird/yeahplayer
Not really a practical proposition (it's not in the store so you need a developer account), but I thought it was neat nonetheless.
Now, if Apple would allow sideloading...
Theo
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