Place the duck onto an oven tray skin side down. Place the orange into the duck cavity with some sea salt. Place into the oven and cook for 30 minutes. After 30 minutes turn to skin side up and cook for a further hour.
In a high sided roasting dish place the fennel, cider, chicken, stock, apricot and thyme. Place into the oven and braise for 45 minutes.
Once braised remove the fennel, keep warm, and transfer the liquid into a sauce pan. Add the sugar and bring to the boil, turn to a simmer. Reduce to a thickened sauce and leave aside to serve.
To serve carve the breast and legs from the duck. Slice the breasts and arrange onto a platter next to the braised fennel. Season with salt and dress with the sauce.