You can get a prepay smart meter one company specialises in them.
Utilita energy.
The other reason for smart meters is so that you can be charged different rates at different times of the day/week.
The highest rate is charged between 4 pm and 6.30 pm on weekdays.
It is a peak time because people are getting home from work and putting on lights, ovens, heating etc while industry is still using its maximum power load.
You can see how much electricity the UK is using and generating at any one time on this link
http://www.gridwatch.templar.co.uk
It is updated every 15 minutes.
You can watch the solar power drop as the sun sets !