BBC explains early 'Doctor Who' release

It was released early as part of a testing procedure ahead of the official launch.

Anwen Aspden, executive producer at BBC Wales, said: “The reaction so far has been overwhelming, but we’re still investigating whether we should tweak certain elements up to release on 5th June.

"So whilst those who’ve downloaded and enjoyed it in its current iteration have the advantage of playing through it early, there may be some minor tweaks coming."