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I wrote earlier that the Stansted Express was going to once per hour from 23 March. The Heathrow Express is also reducing service in light of the reduction in flying. Their slogan was in fifteen minutes, every fifteen minutes but that’s not how it is until 5 April. Please see the schedule above for more information.
And Gatwick Express goes hourly from tomorrow, then half hourly from 30 March.
https://www.gatwickexpress.com/travel-information/plan-your-journey/service-updates?uq=637202706411070000#INC1F67D8B3B4024F968B4F73B6DC7BD48B