In all the discussions/concerns about the BV7-40 MkIV I deferred my order and bought an ex-demo BV8-32 which was installed on Friday.
The install was achieved by youngest son as I am overseas. So after many emails, and a few long 'phone conversations we settled on a plan. My son, Tom, and Sue went out and acquired the necessary extra cables to achieve the following:

Sue emptied out a cupboard, and even did some carpentry, so we could hide all the cabling and bits & pieces:

And then together with the B&O service man they connected everything and powered it all up - voila:

So far they have enjoyed watching TV ("Silent Witness" above), PS3 DVD, PS3 pulling a video file across the wireless network (crashed the network at one point), music from the BeoSound 4 in the other room (CD, FM, and SD card), and music from the BeoPlayer (in the old compaq laptop).
The great thing about this, apart from it working so smoothly after many hours of planning and preparation, is that Tom has gained a deep insight and appreciation of the technical aspects of B&O.
And a final word of thanks to Tony for coming up with the deal and being so flexible, for Kim for being equally patient and entertaining, and for Gavin who did not realise how we would be pushing the B&O limits on this one.