@K21962
Britbox, Acorn, and PBS are all available on Roku.
The PBS Passport, Britbox, and Acorn call all be watched on your Roku if you subscribed to them through Prime Video (which you then install on your Roku), or if you subscribed to each of these services directly.
PBS Passport is available to Roku users through the PBS app.
https://help.pbs.org/support/solutions/articles/12000012972-how-do-i-log-into-my-passport-account-on...
For use on your Roku, I would suggest subscribing to these services directly, or through Prime, rather than through Roku (RokuPay).
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All the channels/apps available to install on your Roku are available at the Roku Channel Store.
https://channelstore.roku.com/browse
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102