I am stuck with same one,But somewhere my head I have an Idea they had one when Margo's christmas things did not come and they spend christmas together and Tom had a turkey for christmas which he had named Margo, but i have been looking everywhere and cannot find any thing but have nothing to say if i am right or wrong some one might pick up on it if it is right or wrong living in hope!!
I have watched every episode of The Good Life several times over but am fairly sure never seen or heard of a turkey in it. As you say, Chorley, a cockerel called Lenin.