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... considered to be under-potted for the size of the corm and perhaps just a tad tall in flower.
Steve, I think the answer is double potting purely for exhibition, a cunning ploy used by many.....I'd say about a quarter of the plants I exhibit are double potted on a Friday and un double potted on Sunday. As an added bonus it means you don't even have to clean the pot!
Joking aside, if I'd have been organised and knew that I was going to exhibit at the show back in the summer I'd have repotted into plastic before regrowth started and then double-potted into a suitable, larger clay.