Two days before Christmas I prepare a spicey brine solution, with pepper, star anise, orange and lemon zest, juice and whole squeezed shells and any other flavours I fancy. Immerse the turkey, keep cold till Christmas day then pat dry. Anoint with butter and roast slowly with lots of basting. Time depends on weight.
I keep the bird cold by leaving the steeping vessel in the garden, covered with boards weighted with brciks to keep next door's dog off it.
All very Nigella, but it makes for very tasty moist meat.