The latest Woodland Natural Capital Accounts were published by the Office for National Statistics in February 2020. These classify 85% of woodlands in Great Britain as in a favourable condition for tree health. They also provide information on the number of sites and felling areas under Statutory Plant Health Notices.

The UK Plant Health Risk Register contains the details of over 1,000 plant pests and pathogens which have been assessed for their potential to be damaging to the UK. 350 of these are forest pests, 17 of which are considered high priority and are tracked in an annual corporate performance indicator published by the Forestry Commission.

Deer, grey squirrels and rabbits can also prevent trees and woodlands establishing and realising their full potential.

This information is used by the Forestry Commission to assess applications for new woodlands (for timber production and other purposes). Landowners who do not include a mixture of tree species, suited to site conditions, adequately protected and resilient to known pests and disease threats, will not receive grant aid for woodland creation. In England, grants are available to help owners restock woodlands after felling due to a tree health issue, including where disease has killed ash, a broadleaf species planted for timber production in the past. The Government also works in partnership with others to reduce the negative impacts of squirrels and deer on trees.