The highest point in East Anglia is 100 metres above sea level...
[ Caveat Wikipedia ]
http://en.wikipedia.org/wiki/List_of_English_counties_by_highest_point
Cambridgeshire's high point is 146m in Great Chishill (on my usual London/Cambridge/London route).
Essex has a point 1m higher but it's less than a mile from the Cambridgeshire high point.
@Greenbank started
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[ Caveat Wikipedia ]
http://en.wikipedia.org/wiki/List_of_English_counties_by_highest_point
Cambridgeshire's high point is 146m in Great Chishill (on my usual London/Cambridge/London route).
Essex has a point 1m higher but it's less than a mile from the Cambridgeshire high point.