The company wants to show us its appreciation for how we have kept London moving during the pandemic. Bless.
Of course, it would be inappropriate for this reward to be financial, what with the current cash crisis. So management are running a survey asking us whether we would prefer a personal letter from the big cheeses, a thank-you video or a souvenir mag.
We even get to suggest an alternative sign of their appreciation. Tubeworker may well log on and suggest 'a guarantee that you will not attack my job, conditions or pension'.