Manx Gold

spn

I have recently been reading a collection of Christie short stories including the one with the above title, which is about a treasure hunt on the Isle of Man that was used to promote its tourism industry. Were the clues ever explained ? By googling "daily dispatch isle of man 1930" (the story having been serialised in that paper that year) I discovered 3 of the 4 rough locations, 2 of which I had already guessed based on clues in the story not available to the characters in it. I also believe I know the remaining rough location. But what I'd like to know is how the clues available to the characters enabled them to pinpoint the locations.

GKCfan

Which edition of the story do you have?  In the US The Harlequin Tea Set anthology, there's a brief essay at the end explaining the clues, but unfortunately it's not very specific.