Have you checked to see if the pump is running?
You can sometimes feel/hear the pump running if you touch or put your ear close to the radiators. If you know where the pump is then you can carefully touch it, you should feel a gentle vibration from it. If it is not pumping then it can be quite easy to get them going again by using a screwdriver.
Have you got hot running taps at the moment?
Chris
November 2007