Unfortunately, doesn't work for me, just left with a screen saying ready to cast and the little blobs going around on my phone/tablet. Tried to cast from 2 devices, the same thing happens on both...
This may not be applicable to your setup, but if you are using a BT Router then make sure the smart setup feature on the Router is disabled.
Here's a link with instructions on how to switch off smart setup on BT Routers.
Obviously ignore this post if you are using a different branded Router, but the above information may come in useful for BT customers having problems casting.