Mid-morning today, the lights suddenly went very dim, and slowly got dimmer for about five or ten minutes. Clearly a big drop in voltage.It was then just as suddenly restored.
It was enough to scramble the brains of my piano (electric) changing the settings on it, and the boiler was so baffled by the event it stopped work entirely, and had to be coaxed back to work by power cycling it.
My desktop carried on as normal and so did the monitors on it. I guess they have switchmode supplies that will operate down to about 100 volts.
Did anyone else notice this?