Heat oven to 200C/180C fan/gas 6. Season the chicken and place in a snug roasting tin. Drape the bacon around the chicken and roast for 15-20 mins until the bacon is crisp and the chicken just cooked through.
In a bowl, mix the garlic oil, lemon juice, lactose free cream and Parmesan, adding a dash of Worcestershire sauce, if you have any in the cupboard. Discard the outer leaves of the lettuce and tear the rest over a platter, mixing gently with the dressing. Serve with the chicken and crisp bacon, shaving over extra Parmesan, if you like.