“Jumbo Jet” by Spike Milligan?

There's not much to work with here -- it really is pretty much a silly poem about an elephant. If I were to make a serious ysis of it, I'd probably start with the idea that the poem appropriates the meter and tone of nursery rhymes to talk about modern modes of transportation (planes, buses, trains) as if they were long-established folk traditions. It also captures something of the disorienting and oppressive nature (why is the elephant imprisoned by the police?) of the modern city.