Nigel,
I am impressed... you have done your homework!
The Ocelot cannot directly receive the 455KHz signal, the Xantech converter is the correct approach.
We shipped an order of Ocelots to Smarthome last week, they should still have stock.
We just released the new CD this week, so you will need to go to the web for the most recent manuals and code revisions...
www.appdig.comDan Boone, ADI