Witham are now level with Soham, both being just three points behind fifth-placed Aveley. But Millers have two games in hand.
The other game in the division was a 1-1 draw. Luke Ingram gave hosts Sudbury a 35th-minute lead from the spot and 18-year-old Ryan Blackman replied for Tilbury three minutes later.
Keep up-to-date with our exclusive email newsletters.
Subscribe