How can we fix our hot water?

Last night, we tried to set the timer on our central heating for the first time since moving in, we then had to bleed the radiators to get some hot water through. Not all of them warmed up even after we bled them, and we left the valve open for a while.
Then this morning, the radiators didn't come on as per the timer and now the hot water doesn't work either, although the boiler (Worcester Boiler) seems to fire itself up when we turn the taps not hot water comes out. Can anyone help?