According to Richard Mabey and Tony Evans writing in 'The Flowering of Britain' (Hutchinson & Co 1980) Spring, as measured by the first flower openings of given species, advances from South to North in Britain across flat ground at the rate of roughly 2 miles per hour.
The progress of this gradual greening of Britain may be seen at:
http://www.naturescalendar.org.uk/findings/spring_from_outer_space2
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