Cinnamon buns for Christmas morning

This recipe is from the wonderful Arianna Halshaw, baker and pâtissier extraordinaire. Arianna is my colleague at Natoora, but until recently she owned her own bakery, Bittersweet Bakers. Since Arianna started working with us, office treats have taken on a whole new meaning (and my waistline a few more digits).
I arrange cooking classes for staff once a quarter and Arianna has been kind enough to teach a few of these. We did a Christmas special recently where she shared these cinnamon buns for Christmas morning.