Honeywell ST9400C Programmer 
ST9400C is a 2 channel programmer, designed for control of both heating and stored hot water in complete systems.
The heating and hot water programmes are completely independent, to allow the system to be operated in the most energy efficient manner possible.
This unit is a 7 day full programmer that gives great flexibility offering up to three on/off switchings per day, additionally each day can be programmed differently.
The ST9400C controller also features a 'Holiday' button allowing the user to switch off their heating for a specified number of days (1 to 99) while they are away from home
Automatic summer and winter time change and up to 3 events per day
The timer also has temporary or permanent override facilities.
The ST9400C complies fully with Building Regulations Part L1 for England & Wales and Part J for Scotland & supercedes ST6400C so is a direct replacement