looks like the power to the radiators has been switched off at the main fuse panel. This is usually located in a cupboard in the hall or elsewhere, and is fed from a timeswitch (probably next to another distribution panel supplying electrics to the rest of the flat). See if the lever switch is in the "ON" position.
You will only get electrical power to the radiators at night usually after about 10pm.
Martin
September 2007