Sometimes services are location restricted, and that often happens with British content. However, I think your problem was you were not spelling theatre the same way they do. When I searched the channel store for National Theater, I found nothing. But searching for National Theatre, I found this:
https://channelstore.roku.com/details/971f5455f07936a2e03fb467f2e7a78b/national-theatre-at-home
Dan
Roku Community Streaming Expert
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