From my experience as a chef I would agree with Paul Kribbs' comment that freezing pastry raw has no discernible effect on the quality of the cooked product whereas freezing cooked pastry can result in a dryer texture.
I would say though that if freezing the whole pie raw that it be allowed to thaw completely before cooking. In theory it COULD be cooked from frozen but there are too many variables (i.e. density of the stuffing, whether rusk/moisture has been added, size of the pie etc) to be able to estimate easily the recommended cooking times for frozen. So unless you have a meat thermometer I would say thaw it first and use the cooking times shown in Paul Kribbs' recipe.