Room 5E
From Tardis Wiki, the free Doctor Who reference
Room 5E was a room at Coal Hill School. In June 1963, and out-of-time Ian Chesterton suggested that perhaps the meeting the native Barbara Wright was trying to reach was in Room 5E, rather than the Room 3E he had led her to. Ian was trying to prevent a meeting between Barbara and her future self. (AUDIO: Home Again, Home Again)