HA on NUC ... Daylight Saving Time

I’m running HA (core-2021.3.4) on a NUC; if I type “date” in the HA Terminal window, the NUC’s “system time” is showing as UTC. But the Time Zone is set to Europe/London within the General Configuration page - which is what I want it to be.

How do I get the system to automatically change to BST / GMT each year? Reboot Host within Supervisor / System doesn’t change anything.

TIA