Increasing the level of insulation in roofs, walls and floors will improve the achieved U-values. This means with lower U-values in place, there will be a reduction in the requirement for heat and power in homes.
As part of the Department Business, Energy & Industrial Strategy, they are aiming to half all energy usage by 2030. Their mission for this can be found at the following link.
https://www.gov.uk/government/publications/industrial-strategy-the-grand-challenges/missions