You may just have noticed all the hoo-ha in recent days about TfL's bold decision to remove the Thames and Zone boundaries from the Tube map (and the subsequent wrist slap from the Mayor). Not bold enough, we say. Let's sand away all the extraneous information.Tourists are the only group of people who really need a Tube map. Locals already know their way around, and business visitors always take cabs. So if we only need to cater for John Q. Sightseer, the map condenses down to something really simple.Voila, the whole network distilled into three lines and twelve stops.