Mix the juice of 1 of the lemons with 3/4 of the butter, melted. Set aside the squeezed lemon halves, we'll use them in a minute

Fry the onion quarters in the rest of the butter on a low heat for 5 minutes then set aside to cool

Making sure the giblets have been removed first, fill the turkey cavity with the onions, the squeezed and unsqueezed lemon shells and the thyme sprigs. Close and secure with a cocktail stick

Slid your fingers under the skin around the neck, over the breast meat and spoon some of the lemon butter into the pockets you've made. Rub the rest over the skin, not forgetting the legs and wings

Slice the bacon in half lengthwise if it's wide and arrange over the breast in a lattice pattern. It will shrink back a bit during cooking. Cover loosely with foil if you don't have a roasting pot with a lid

Mix the maple syrup with the cinnamon and 30 minutes before the end of the cooking time, remove the lid / foil and brush the syrup mixture over the bird. Return to the oven uncovered for the final 30 minutes

Transfer the roast to a platter and cover in foil. Put a tea towel on top to keep it warm and leave to rest for 20 minutes while you get on with the gravy. A roast bird covered this way will keep it's temp for almost a whole hour, so you've plenty of time to do sides even if your oven is small

To make the gravy, skim the fat from the juices in the roasting tin and discard, then stir in the flour. There will be quite a lot of fat because of the butter. Cook on the stove top for 4 minutes, stirring, then gradually stir in the stock until thickened. Heat until simmering, stir, then serve