Well I spoke to Honeywell and the open therm stats are not avaiable untill September so I guess we need to watch this space.
My understanding of the "open them" principle is that the device (either a room stat or weather compenstor) simple tells the boiler what the actaul temp is and the boiler...
Thats interesting, I will talk to Honeywell and see if they can shed some light, if you are right (I suspect you might be) then this adds even more confusion to the issue, one of the aims is to stop the boilers cycling on and off, this flys in the face of that philosophy.
Cheers
You need to get a Honeywell Chronotherm stat, this is wireless and will modulate your boiler, see the following link
http://europe.hbc.honeywell.com/products/ecatdata/pg_cm920.html
This area is a mine field the manufacturers don't seem to understand that people want wireless stats that...