Every now and again my Tube ride to work on the District line is enlivened by children on a school outing.
Presumably they are heading for the Science Museum or possibly the National Gallery. Often, they have different coloured badges stuck to their jumpers. As far as I can work out, if, for example, you are a red, then you’re meant to sit with other reds, and sometimes the teacher barks instructions such as: ‘Could the reds try to be a little quieter please?’, or asks: ‘Blues, how many more stops until we get there?’
This last question gives rise to a...

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