I have always been interested in the natural indicators the herald the change in seasons. However, trying to find books on the subject has so far proven rather fruitless!
I wonder if anyone new of any on phenological signs, specifically, for a UK context.
If you go the the NHBS website and search on phenology, this is one of the results:
Plant Phenology in a Changing Climate
Arif Mohammad Faisal(Author)
88 pages, b/w illustrations
Publisher: Lambert Academic Publishing
(https://www.nhbs.com/publisher/lap)
It also suggests numerous copies of British Wildlife magazine that contain articles on phenology.