W401 plant room control panel, 24 Sep 2011. This was for the original computer room in the W404 area. The humidity recorder and temperature recorder can monitor three different rooms, as listed bottom left and the selector switch indicating which one to show. 7 is programmers, roughly in W409 I think; 8 was Engineer, in W403 I think and 9 was HEO office, whatever that stood for! I think that was near the main entrance to W404 but that room was swept away.