This one is at the A12 end of Margaretting. Parking available in disused car wash entrance nearby.
If you would like to complete AWNTY? Galleywood Common you will need to collect some information from the milepost here:
Distance to London = MN
Distance to Ingatestone = P
Distance to Chelmsford = Q
Please do not post spoiler pictures of the milepost in your logs!