This work investigates the historical origins and current status of nearly 150 tree species found throughout the British Isles. Alan Mitchell, a renowned dendrologist, utilizes his extensive field observations and botanical expertise to document the growth patterns, historical introductions, and record-breaking specimens of these trees. The text serves as both a historical record and a practical guide for identifying the most significant examples of British arboriculture.

The text is regarded as a foundational reference for arborists and naturalists interested in the specific botanical history of the British landscape. Its focus on individual specimen records provides a unique, data-driven perspective that remains relevant for those tracking the longevity and health of significant trees.