Faz:I still cannot sort the AV out though - I have to turn my Sky reciever on and off and the TV auto switches to the AV input but no AV selector on the remote which I found strange
That's because the B&O remote control philosophy is a bit different from others. You're not expected to select sockets or interfaces (and try to remember what is connected where) - instead, you simply select the source you want to see (or listen to). Therefore you need to configure the interfaces first.
I believe the best strategy is to connect your receiver to AV2, then configure the AV2 socket to be a "decoder", and then assign a tv channel preset (say channel 9) to need a "decoder" (you can tune it to any frequency). This may sound hairy, but should be clear once you look into the user manual or explore the menus 
Then, whenever you call up "TV 9", the MX will use the signal from your Sky box and not care about the signal from its internal tuner. If you don't have any analogue channels left to watch (I don't), you can do as I did; configure TV preset 1 as "decoder" and remove all other preset channels. After that, simply "TV" will turn the MX on and it will automatically switch to your Sky box.
If you have another external source (like a DVD), I think you can connect it to AV1, configure AV1 to be a "non-B&O VCR" and press VTAPE on the remote to select it.
Regarding the membership, you may find it a little expensive as long as you only have a single B&O product. But once you get a couple more, you'll find that you actually save money (and time!) compared to hunting after manuals and info on the net, buying them on eBay, and so on. However you choose, I'm sure you'll be just as welcome to post on the forums! We're all addicts here, so we know