been suggested by my heating engineer that i need a honeywell cmt 907 stat/timeclock and mount it in my hallway which eliminates my built in segmont timeclock also...seen em on ebay £50 appox but after recent faulty products think im going to purchase it on amazon £70,,fair enough..as for the wiring im guessing i need a L-N supply,a pair for the stat wiring & a pair for the clock..6 cores in total all back to the boiler(2 x 3 cores or 3 x twin & earth 1.5mm ) my boiler is a vokera linea 24 by the way,the cmt 907 has very good reviews on amazon has anybody else used these and worked fine without any problems..or would reccomend any other good quality compatiable product(s) cheers again