There are five hundred clocks in Buckingham Palace. Among them are musical clocks, organ clocks, astronomical clocks and mechanical clocks. I seem to remember, from the days I was there a lot, being told that there was a member of staff whose sole job was to keep them all wound.
Today, they will all need to be adjusted by an hour. It is difficult to imagine the task appearing very high up on HMG's list of key workers and essential roles though,