I had a bag of bits about my person that were left over from the Peco offices to station building conversion. These were the walls that would nave been used at the rear if it had been view-all-round and and the windows and doors for same. I'd earmarked it for a mess hut to drop in between the exit bridges.
The four walls fell together and the roof is simply some 40 thou with strips of 20 thou much in the style of the same company's station building toilet block.
Another highly boring utility building.