I've managed to get 4 Rio's over from the States. I'm keeping one for myself (works a treat by the way - though I'm sure ur all aware of that!). All you have to do is cut the plug off and replace with a UK one, home networking card included.
I'm posting them on this Forum as I've followed some of ur trails and tribulations in trying to get UK companies to deliver on their promises (tried myself for long enough).
Cost? Don't know, I'm open to offers really, if someone makes a reasonable offer I'll be happy - not looking to turn the whole thing into an auction.
If ur intrested either reply to this post or email me direct.