Worldbox's correct channel list at the moment is only...
Canal 24 Horas - Spanish news channel.
Sic International - General Portuguese channel.
1+1 International - General Ukrainian Channel.
Nessma - Tunisian entertainment channel which is coming soon.
I could have thought of many options in terms of international diasporas in the UK.
Channels from Ireland, Poland, Italy, South Africa, Nigeria, Germany, Scandinavia, Russia, Turkey, Greece, Malaysia, Singapore, Hong Kong, China, France, the Indian subcontinent, Australia, New Zealand, Canada, the US, Spain, Netherlands, Belgium, Latvia, Lithuania, Estonia and a few other nations could potentially be a good fit for the service. I'm not expecting grade A entertainment channels for many of these without subscriptions but it should be feasible to have stuff like 24 hour news channels and the wide range of international services from many countries which tend to focus on homemade shows rather than expensive imports and are often shown free to air around the world.
Worldbox won't be useful with three and a half channels but if it got to 20 or 100, then there is very real potential in the service, especially if a wide range of English language international news channels were provided and not just foreign language services.