Hi, the black slabs are granite worktop savers from Argos (about £13 each, if I remember).
The radiator is usually off (or very low setting), as the Pioneer plasma generates enough heat to keep the room cosy (very useful dual functionality from one device).
Concerning the corner set-up, my wife has forbidden me from moving to in front of the window and firing down length of room, so I've had to experiment to get the best sound.
I have found that the outer ring only of the B&W supplied bungs in the rear bass ports gives me best bass balance, and as my Kef subwoofer is in the corner behind the tv, I have added an Antimode bass equaliser (as recommended by many on this forum, thanks). It has substantially improved the bass definition, and sounds like I have a bass-player in the room now.
We had to check behind the tv to make sure that the bass player from our band wasn't actually stuck there and couldn't find his way out
My job for today is to add a second Cyrus X Power in vertical bi-amping arrangement (while my wife is out at the shops). I'll post on how they sound with the CM8s.
I auditioned the CM8s against MA RX8s - the RX8s sounded better musically in the shop, but I can definitely say that the set-up I have now (thanks again to the advice on this forum, and some experimenting) sounds better than the RX8s did.
The rosenut finish on the CM8s (and matching CM1s, CM Centre) plus the beautiful layout of the fronts by B&W has made it so much easier to get this type of kit into the house.