From CAA Skywise:

We have been working closely with the industry during the initial phase of COVID-19 to help aviation’s continuing operations and recovery.

The initial set of COVID licence exemptions, that included extending licence validity dates, expire on 22 November 2020.

Industry and licence holders are asked to make sure they will then comply with the standard licence requirements and act well in advance of that date to make sure any checks or medicals can take place.

For more information please see the CAA website.