The ORR has just released their quarterly data on passenger usage which makes for grim / interesting reading. https://dataportal.orr.gov.uk/statistics/usage/passenger-rail-usage/ - specific file here
Passenger rail usage during the first quarter of 2020-21 was severely affected by the coronavirus (COVID-19) pandemic. An alternative methodology was applied to estimate usage with some ticket types. As a result, there is more uncertainty around the 2020-21 Q1 estimates compared with previous quarters.
Rail passenger journeys in Great Britain in 2020-21 Q1 fell to 35 million (8.1% of the 439 million in 2019-20 Q1). This represents the lowest level of passenger usage since the mid-nineteenth century.