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MarkI think you forgot to mention you have to replant the old stem and keep it growing as long as possible in the hope it will produce another tuber. This usually works but there is a risk of introducing disease into the wound on the new tuber and also the old stem. Not a risk I would take with my sole plant.
Not being one to take my own advice I took the new tuber off my one plant of Eskimo Nell(it looks flowering size) in July and yesterday seeing the replanted stem had died off I tipped it out. There is one new large tuber and two small ones.
This orchid was selected and named by the late Gerry Munday from memory.