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excellent folks thank you kindly for your replies you've been really helpful :lol:

Thanks D_Hailsham& Mario for the info, any idea what the wiring connections would be from the existing room stat to cm907 are they as been quoted earlier by Mario 500 :?: :lol:

Hi AL the existing system is a ST699 Programmer and a mid position valve Tank Stat and Pottertom Bioler gravity fed hot water 8)

Hi, Anybody know the equivilent wiring connections from a Honeywell T61608 Room Stat, with connections on 2 - BL 3 - Y and 1 - R to a new Honeywell CM907 ? :?:

Hi can anyone advise if the new Honeywell ST9400C programmer will directly replace an old ST699B controller which I want to replce :?: