The climate crisis could cause up to 10,000 extra deaths in the UK every year by the 2050s as a result of extreme heat and bring a host of tropical diseases, a stark report has warned.

The worst-case scenario, published in a damning document by the UK Health Security Agency (UKHSA) on Monday, would see average temperatures rise by 4.3C, bringing an estimated twelvefold rise in heat-related deaths by 2070. It adds that deaths could increase by one-and-a-half times in the 2030s.

The figures come from UKHSA’s Health Effects of Climate Change (HECC) report, which examines the effects the climate crisis is already having on British health outcomes.

It states that diseases transmitted by insects – such as dengue fever or Zika virus – could also become widely transmissible across the UK due to the arrival of species native to hotter countries.