The cap was reduced to 30p/kWh for electricity and 8p/kWh for gas. If you are not on a smart meter, you should submit a new reading as soon as possible to make sure your costs are computed as accurately as possible.
This is a shameless inspiration from this reddit post.
Which supplier are you with?
I’m with British Gas; I used to be with People’s Energy but they unfortunately went bust when prices started going up in 2021.