Cook the noodles following pack instructions, then drain, rinse under cold water and leave to drain again. Combine the sugar, garlic, lime juice, fish sauce, oil, and chilli in a large bowl. Season to taste and add a little more of whatever you think is needed – it should be salty, sweet, spicy and sour. Add the fennel, mint, clementines and noodles, then toss to combine. Stir through the shredded chicken. Will keep chilled for up to a day.