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I think you will still be able to buy pure nicotine and high strength solutions based on the wording of the TPD

"No person may produce or supply an electronic cigarette or a refill container which contains a nicotine-containing liquid unless it complies with..."

Pure nicotine and high strength solutions are precursors to the manufacture of e-liquid and cant be used directly in an e-cigarette without further processing. In my opinion this means they do not fit the definition of a refill container.