Line a full oven size roasting tin that fits on the runners with our non-stick sheet and place the turkey in the tin.
Stuff the neck cavity only – it's easy to forget that the stuffing is in the bird until too late! If not putting stuffing into the bird, peel and cut up an onion and push that into the cavities, with a little butter. Weigh the turkey after it has been stuffed to calculate the cooking time.
Smear the bird with some butter, cover it with more non-stick (you'll likely need another large tin liner for this) and wrap tightly with foil.