The great thing is that you too can own this wonderful child carrying contraption as it's for sale on eBay for the next day or so. The starting bid is fifty quid. I love how the seller has made no attempt to try to say why owning a buggy with the Tube map on it may be a good idea. (Although it is a fab idea if you want your child to be a card carrying Tube geek who knows that Tube map like the back of their hand when they grow up).
The only indicator of its err.... uniqueness, is the fact that that it's listed as "rare". You bet! And no before anyone asks, I am not going to buy this, lug it around on the Tube, take a picture of it on some obscure station, ask you to guess where I took the picture and put it up for a competition prize!