A post I made in relation to the ‘3 hours free’ was in this thread and makes useful reading:
It is the spirit of the government plan, they didn’t suggest one will be better off. The government’s scheme is to try and shift usage from other times of the day (periods of peak demand or lower generation capacity) to the ‘3 hour free period’. The scheme doesn’t ‘guarantee’ savings.
The government introduced this ‘scheme’ in response to the criticisms that power has gone up, when in their election campaigns said it would go down. It is potentially another case of the government seen to be doing something, which potentially has no real effect for many (and could even make consumers worse off financially).