Does Loora teach British or American English?
Both. You can choose British or American English in your settings.
1.Open Lesson Settings
Go to Me tab → Settings → Lesson Settings.

2.Choose your English type
Tap English type and choose American English or British English. Loora's accent and vocabulary follow your choice. If you’re not sure which to choose, American English is the most widely used internationally — but both are fully supported.

3.Change Loora’s voice and speed too
In the same menu you can also change Loora’s voice and speaking speed. See Loora speaks too fast. How can I slow her down?.