Editorial
Sources and editorial standards
This site aims to be a reliable specialist resource, which means being explicit about where information comes from and what it cannot do.
How guidance is written
Written guidance is based on published official UK sources, principally Forest Research, the Forestry Commission and GOV.UK, combined with practical field experience of inspecting and managing oak trees on sites with public access.
Review dates
Pages carry a last-reviewed date. Distribution, control requirements and official guidance change over time, so where a detail matters to a decision, please check the current official source directly.
Images
Illustrative image — not a scientific reference photograph.
Limits of online identification
Photograph-based opinion is preliminary guidance. It cannot substitute for inspection on site, nor for official reporting through TreeAlert. Where identification affects safety decisions, treat an unconfirmed sighting as though it were OPM until assessed.
Independence
OPM Advice & Management UK is an independent information resource and is not part of, affiliated with or endorsed by Defra, the Forestry Commission, Forest Research or any local authority. Official organisations and resources are referenced to help visitors access authoritative information. Suspected OPM sightings should be reported through the appropriate official reporting channels.
Supported by
OPM Advice & Management UK is supported by Hertfordshire Pest Control, who provide the professional inspection, monitoring and nest management capability behind the advice on this site.
OPM Advice & Management UK is an independent information resource and is not part of, affiliated with or endorsed by Defra, the Forestry Commission, Forest Research or any local authority. Official organisations and resources are referenced to help visitors access authoritative information. Suspected OPM sightings should be reported through the appropriate official reporting channels.