thanks for your answer toptrish. this model has a heater that you can switch on manually,i found what i would describe as looking like the top of a paper clip protruding from terminal block and pushed this and heard a click.this was directly behind manual control for heater. i could not see any other ones on the output control for night storage control.fingers crossed i will wait and see.
bernie
December 2013
Remove the front [3 screws at the bottom]at the top right hand side is the thermostat,the older type has a round disc with a button to press,the newer type is less obvious,there is a small silver tab in the stat pointing upwards,just push down gently you will hear it click.Make sure both switches are off first