Can't blame the bakery for gifting the cake, although they have a mainly teen following, it's worth while gifting it to Dianne as the Strictly pros are always in the tabloids for one thing or another & as the Strictly demographic is older, are of working age & have a need for extravagant cakes (milestone birthdays, christenings, retirements, etc) it is clever on the bakery's part, as they did get a mention in hello magazine.
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As for Joe & Dianne's rabbit like behaviour, this is one of the only difference between them becoming exactly like Zalfie.