As you will all be aware due to the current Covid-19 crisis, there have been many and frequent changes to the bus network throughout Hertfordshire.
Bus service levels are subject to frequent change.

You can check your service information before you travel at:

Arriva have changed / reduced the frequency of some Stevenage timetables.
If in Stevenage make sure the bus stop timetable is displaying the right up to date timetable (some were still showing old timings) . If in doubt use the Intalink or Arriva app.