1 leek, thinly sliced
1 small lemon, zest finely grated
1 rosemary stalk
450ml/16fl oz chicken stock
3 tbsp plain flour
2 tsp redcurrant jelly
dash Worcestershire sauce
salt and pepper
dash gravy browning
1 tsp paprika
25g/1oz butter, softened
6 rashers smoked streaky bacon
1 large turkey crown, on the bone (about 3.5kg/7lb 11oz with wings, or 2.7kg/6lb without wings)
200ml/7fl oz dry white wine