Thought it might be useful to let people know that I have bought some boards off the guy in Kenilworth's link: http://forums.caves.org/viewtopic.php?f=26&t=18121
I did a bit of digging and mutual contact finding to attempt to verify him and was satisfied that he is a real person and is producing the boards. I had the boards posted to someone in the US who will bring them back later so I don't actually know if they work yet :D but they have been delivered and from photos they look the part and includes all the things that you would expect (the board itself, non-mag screws, non-mag battery etc.). I will update as soon as I've converted a disto with them (hopefully in a month or two).
He is charging $370 for the kit. This includes the non-mag batteries which is some consolation but is still a fair amount more than it cost before, and this is before you get import fees and VAT if they are posted to the UK. I had a sort of grant to purchase them and someone in the US to post them to so it was affordable for me but I imagine this might be too much for a lot of people.
I think he was working off a stockpile of the bluetooth chips but he also seems to think he's found a new supplier so it may be a (pricey) option going into the future.