Add your username/password in app/config/traveline.php and add the base URL of TfL Countdown in there too. composer install and follow the error messages to get it working.

Both NaPTAN and GTFS are stored in Postgres. Redis is used as a cache for the Traveline API as it's slow (2500ms vs 100ms for a GTFS query). London's API is lovely and needs no faffing about. NaPTAN is filtered using the national unused bus stops database- all stopping points are contained within the database but (in theory) only bus stops will be marked as inuse.