Have to say that my 500Mbps Powerline adapters have streamed HD multicast perfectly since I got BT Sport. Powerline AV of 200Mbps or better should work fine for the majority of people - it's just the old 85Mbps ones that BT still provide that won't cope.
So does anyone know why its has been delayed ?
Given that BT Vision have been successfully recording internet channels on what is generally accepted to be an inferior box for ages and Youview box has had the capability to handle recording of two (linear) channels since the beginning and has had the capability to receive an internet channel stream since beginning of August it is scarcely credible that recording & playback of internet channels has taken so long to be provided.
The software to record BT Sport etc was formally released to all about 21/11/2013.