Biodiversity is the variation of life forms within a given ecosystem, and is often used as a measure of the health of biological systems. The biodiversity found on Earth today consists of many millions of distinct biological species, which is the product of nearly 3.5 billion years of evolution.  

The NHS Forest encourages sites to consider biodiversity when planning their planting, and has links with several groups who are focused on biodiversity and can help with information or local contacts.

Local Wildlife Trusts campaign for creation and better protection of our precious wildlife and habitats and recognise that the central roles of access, awareness raising, education, community engagement and participation to the overall aim to achieve a UK richer in wildlife.

The Woodland Trust has a useful summary of the research and programmes current in woodland biodiversity:

The Convention on Biological Diversity (CBD) is an international treaty to sustain the diversity of life on Earth, calling for the development and enforcement of national biodiversity strategies and action plans. They were to identify, conserve and protect existing biological diversity and to enhance it wherever possible.
The UK Biodiversity Action Plan (UKBAP) outlines the UK’s biological resources and addresses their conservation at national levels. You can find out about the UK biodiversity action plan here:

The NHS forest protects biodiversity by encouraging conservation and creating a habitat to nurture local wildlife