Modeller

... Or the proper fan might make a model of the Underground. Probably the leading Underground modeller is John Polley, who used to be a Tube train driver.

In an ingenious approach, a team of 11 scientists – including biologists, geneticists, glaciologists, computer scientists and ice-sheet modellers – looked at the genetics of Turquet’s octopus – a species that has been living around the Antarctic continent for about 4m years.