Remove the turkey from the fridge and set aside. Put the herb butter ingredients in a bowl and mash together well.
Remove the giblets (if your turkey has them) and put the turkey into a well-lined roasting tin or a foil tray placed on a baking tray (to support it). Pat the turkey dry with kitchen roll, then use a small sharp knife to gently part the skin from the breasts at the highest point. Using a clean hand, separate the skin from the meat. Repeat on the other side of the bird too.
Push about half of the herb butter under the skin of the turkey. You can use your hands on top of the skin to help push it down. Spread the rest of the butter over the top of the skin. Lay the bacon rashers carefully over the turkey breast (I like to criss-cross them as this helps to stop them falling off as they cook). Cover loosely with tin foil.
When you're ready to cook, preheat the oven to 180℃ fan/200℃/Gas Mark 6 and cook according to the timings above (or on the turkey packaging), basing the cooking time on its weight.
Baste the turkey every hour or so. If, an hour before the end of the cooking time, the outside of the turkey or the bacon are not turning brown, remove the foil to allow for a crispy finish.
When the turkey is cooked through, remove it from the oven but leave it in its tray (lots of juices will come out). Set aside somewhere not too chilly in the kitchen and keep it covered with foil. Pop a clean bath towel or a couple of clean tea towels on top of the foil to keep the heat in and let it rest for about 1 hour.
When you're ready to serve, pour the resting juices from the tray into your gravy (if you wish). Place the turkey on a platter and carve.
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