If you follow the Flitch Way out of Great Dunmow towards Takeley you will come across the Dunmow Cutting. The Flitch Way was, of course, the main Railway line between Bishops Stortford and Braintree and the Dunmow Cutting is a remnant of that with its path between 2 steep sided sides that are full of wild flowers, butterflies, grasshoppers and damselflies.
I have no idea what sort of flower this is, but it caught my eye.