Source: https://www.gov.uk/government/news/reduced-rail-timetable-agreed-to-protect-train-services-and-staff

The Government has worked with rail operators to agree a reduction in rail service levels to help tackle the spread of COVID-19.

Operators will continue to run core services ensuring people remain able to get to work, can travel to access medical appointments and the flow of goods continues across the UK.

We are monitoring demand closely and should it become necessary in the weeks ahead, we will adjust services and timetables to ensure they’re being delivered to best effect where they’re needed most, in accordance with our plan. We would advise anybody who has to travel to check the time of their train on the National Rail Enquiries website before they set out.