A spokesman from Boris's office said de-sweating the tube is still a priority, then went on to display an amusing (to us, at least, but we're quite childish sometimes) and deep love for the word 'work', perhaps indicating a need to learn some wordsmithery from his boss: "if we can integrate improving the way the network works as well as cooling it, as part of the upgrade works, that is really being more efficient".
We're not sure what that actually means.
Bringing down temperatures on the tube has always seemed like one of those fantastic Tomorrow's World predictions of the future to us anyway - maybe we'll get chillier trains at the same time we get robot butlers and flying cars.