What does the red light on a key meter(electric)mean?

we have a southern electric key meter and the little red light next to the display seems to be constantly on or flashing. even if we turn virtually everything off, and we seem to be burning through electric really quick.used to use £15-20 p/week now £30-35 p/week. not sure what this light is supposed to show,does... show more we have a southern electric key meter and the little red light next to the display seems to be constantly on or flashing. even if we turn virtually everything off, and we seem to be burning through electric really quick.used to use £15-20 p/week now £30-35 p/week.
not sure what this light is supposed to show,does it only come on when using a lot of electric or is it meant to be on constantly.
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