As you say, I am sure these maps related to one of the Hydro Plant Operations. I don't know if you have, or have read "Between Silk an Cyanide" by Leo Marks? But it is an excellent book about Marks time with SOE in London. It's excellent, amusing, informative and historic... But at one point Marks is training one of the Norwegian groups on coding, and I'm sure that during the run up to the actual Operations, there must have been a lot of map study by all associated organisations. So I would think these maps were used in some form of planning work. Would they have found their way on to the ground operationally - probably not. Could they have found their way into a drop aircraft? Possibly (if wrongly). But my money would be on use in briefing and planning... A great set, either way!
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