Back when I was working ABP sent us a Powerpoint from NR showing the stages of the job, start date was in 2017-18!
Briefly:
Redbridge: Extend Nos 1 & 2 Reception to Country to give an increased run round length. GF to remain.
Millbrook: Down Docks Branch connection moved towards London, into the Down Loop Extension'
Millbrook: Signal E851 at the Dock Gate (Gate 12) to be replaced with a Stop Board (E851). An additional Stop Board (E853) in the Up Docks Branch, which becomes bi-directional. Both Stop Boards apply to Down Trains. Signal E852 for Up trains from the Docks remains.
Maritime: Remodel the throat area by extending Road B into Reception No 1, and installing a scissors crossover between the new track and the Arrival / Departure Road.
The Stop Boards at Gate 12 are to allow NR to take possessions outside the gate without having to place stop boards and detonator protection inside ABP property. (All to do with overlaps in advance of signals, or some such.) As an aside, one night I had to ask the PICOP's agent (asleep in his car!) to get permission to lift the protection to let me run an engine round in the Docks!
I've not been down that way for some time, so I don't know how they are getting on. I know that the timing went west due to the Council refusing permission to extend at Redbridge. has that been resolved? (Another example of Local Authority wasting other peoples' money, perhaps.)
Pat