Vintage comedy now on BBC2 with Dads Army. This tune was etched onto my brain when I was very young. I still dont see the relevance of the A21 other than it rhymes with gun.\rbr\rbrWho do you think you are kidding Mr Hitler\rbrIf you think old Englands done\rbrWe are the boys who will stop your little game\rbrWe are the boys who will make you think again\rbrSo who do you think you are kidding Mr Hitler\rbrIf you think old Englands done\rbr\rbrMr Brown goes off to town on the A21\rbrThen he comes home each evening \rbrAnd hes ready with his gun\rbrSo who do you think...