Havering has been named London's least energy efficient borough, with just 43.15% of its homes rated C or above, compared to a London average of 56%, according to research by Cut Plastic Sheeting.

The research revealed that almost half of all assessed properties in London (1,065,020 homes in total) are currently below the C rating that landlords will be legally required to meet by 2030, with the gap between London's best and worst boroughs standing at 36.6%.

Daniel Southern, Managing Director at Cut Plastic Sheeting, said: "The scale of London's energy efficiency challenge is clear, and with landlords now required to bring properties up to a C rating by October 2030, there is still a significant amount of work to do across the capital.

"There are a range of improvements homeowners and landlords can make to improve a property's energy performance, from low-cost measures like draught proofing, low energy lighting and hot water cylinder insulation, as well as larger investments such as loft insulation, upgraded heating controls and solar panels.”

Tower Hamlets recorded the highest proportion of energy efficient homes in the capital at 79.75%, with 84,365 of the 105,792 certificates assessed rated C or above. The City of London ranked second (67.95%), followed by Southwark, where 54,675 of 81,807 assessed homes met the standard (66.83%), Hackney (66.78%) and Greenwich (63.06%).

Havering was followed by Enfield (43.69%), Richmond upon Thames (44.39%), Bromley (44.46%) and Redbridge (44.77%), making them the boroughs with the lowest proportion of energy efficient homes.