Thanks for the info and I appreciate help from you guys.
When you sa isolate, I take it you mean the electricity supply to the valve? I can do this but as for removing the valve, is this easy? I'm pretty good at DIY ! Will I be covered in water if I remove it ?
Thanks
A few months ago we noticed the radiators were on when the hot water was on. Looking at various topics here I suspected the motorised valve was at fault so recently I called a plumber who changed it to a new Sunvic SD2701 3 port valve (reading from the empty box!)
We thought it had sorted it...