Well done.
IMO, the correct entry in the Schedule is 57 which refers to Tilling Rd.
As observed previously, it's item 57 of the second set of specified roads which misleadingly appear under a London Borough of Barking and Dagenham heading, but this poor piece of drafting cannot change the location of or responsibility for the roads.
Page 9
57 NORTH CIRCULAR ROAD (A406) OFF SLIP ROAD, the south side from a point 3
metres south-west of the extended north easternmost building line of Garden Court Hotel, Tilling Road to its roundabout junction with the unnamed M1 Motorway slip roads
It seems to me that the prohibition refers to the road being turned from, not the road being turned into, and this would seem to be confirmed by the authority's TMO, therefore I believe that item 57 page 9 is the applicable reference. Either way, the authority is in a complete state of denial hence my suggestion to the OP in the current thread on this location to write to the Chief Exec and put an end to this apparent abuse of power.