What is on the handlebars of this bike? Sadiq Khan, the current Mayor of London, was spotted riding a (strikingly regular) bike around in May 2020.
What is the contraption attached to the center of his handlebars?
Looks to me like Shimano CI Deck gear indicators. They connect to the shifters with a little cable that pulls a dial to tell the rider what gear they're using.
https://si.shimano.com/pdfs/si/SI-6XJ0A-000-ENG.pdf
From the user's view: