I had the misfortune to be stopped along here by what appeared to be some kind of farm worker in a car. He said "no cycling down here" and I pointed out this stretch was a bridleway. He said it wasn't. My source is the Essex Council website, which states this us:

central asset id: PROW 39_12
parish: Manuden
path number: 12
classification: Bridleway
length: 1637
unit: metres
district: Uttlesford
parish code: PROW 39