In reply to Al Evans:
15-20mins for me at 180c, until the cross cut into them opens right up. I was doing them on the day I'd collected them from the woods, so that may have a bearing on cooking time.
With boiling them, I do them for 10mins then let them cool in the water prior to peeling. Much easier that way.
(oh, and if you boil, peel & mash them then mix with cranberry, breadcrumbs, 2 eggs, some butter and shredded smoked bacon, it makes an excellent stuffing for pheasant)