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Urban trees are instrumental in providing ecosystem services to urban society. However, they are subject to many pressures linked to harsh site conditions created by the urban environment, climate change, attack by pests and diseases and the political and social influences that control how urban trees are perceived and managed. An ongoing provision of services from all trees within an urban area (known as the urban forest) can only be achieved through high resilience to these pressures. This study aims to examine the current state of composition, condition and structure of 12 urban forests across Great Britain, by reviewing data collected from i-Tree Eco city or town-wide surveys and recommending a framework to rate their sustainability. The study shows that urban forests are hardy to local winter temperatures and in good health, but lack in large size trees and tree species diversity. Also, several urban forests offer small percentage canopy cover. The wider application of this framework and the creation of detailed tree strategies could help local authorities to establish management strategies, set goals and monitor progress towards achieving greater sustainability.