"The Buildings" ... as
GlobalNav noted earlier, some are still visible on Google Earth. Zooming in shows no trace of a footpath to the short extensions [my first thought was some sort of entrance porch], so I would surmise they're the ablutions associated with the accommodation block. Sadly there are no decent images pre-2005 using the 'time-line' imagery on GE.
And of course they were laid out neatly - this is post-War work, with no need to distribute randomly in case of air raids
Laying drains and other utilities would also be easier in straight lines, I suspect.