Upminster station was opened in 1885 by the London, Tilbury and Southend Railway and its original entrance and structure beside the main-line platforms and car-park survive from that date.
The station was greatly expanded in 1932 by the London, Midland and Scottish Railway and the main station building, the two footbridges and the buildings on the remaining platforms were constructed in typical 1930s style. A further platform for services to Romford was a later addition.
The primary station building, which gives access to the main Station Road, has been extensively redeveloped in contemporary style and includes three retail units. The original Victorian station structures remaining beside the main-line platform 1 have been refurbished and now include a secondary ticket office and waiting room with an exit to Station Approach and the car-park. The original platforms were linked by a subway which has since been abandoned.
You are looking for a magnetic pot. Beware of Muggles during the rush-hour!