CzechOut wrote: See rule one of our four little rules. For a source to be valid, it must be a story. No exceptions.
Wasn't "P.S." considered valid by this wiki until Chris Chibnall stated that it was intended to be filmed but was not due to the actors not being available? That seems like out of universe information, which was why I thought that the BBC stating that the Claras are the same would also count.
Sorry about the confusion, but I'm just trying to understand the difference.