Great link, it jogged my memory about a question I'd forgotten about. Might be better asked in the spotters' thread but what's the reason for most hangars to be arranged in a slight arc as opposed to being dispersed?
I emailed the question to Paul Francis , one of the authors, and he replied ;
"Passive defence, enemy aircraft fly in straight lines! Allows time for personnel to get to the shelters but pre-war stations were non-dispersed compact layouts, dispersal did not really take off (pun) until after the outbreak of war."