Place a large sheet of greaseproof or baking paper into the middle of a roasting tray. It should be large enough to wrap around the chicken plus plenty of extra for folding over.
Season the chicken with salt and pepper, stuff with half of the lemon slices, and place breast side up in the middle of the paper. Sprinkle garlic slices, and thyme sprigs evenly over the chicken. Lay the remaining lemon slices over the breast. Fold the paper over the chicken forming a loose parcel.
Bake in the preheated oven for about 1 1/2 to 2 hours or until the juices when a skewer is inserted in the thigh are no longer pink.