Does anybody know about Smart Meters?

I don’t use a lot of electricity, so my daily display is usually under £1. However, the last three days it has almost doubled, and is sitting at 97p just now. I haven’t used dishwasher or washing machine, and no appliance is ticking away in the background. Have electricity charges gone up massively in the last three days?
I am loath to call Scottish Power, as I can’t be a*sed trying to explain it to a half witted adviser ( and I know they’re not all half witted. I used to be one!)