How do you change utc time on a digi tacho?

Daz48:
Do I do a manual entry through local time or utc time as my tacho is 1hr in front

As Norb says above: tachos are set to UTC time, and never change from this.
Your tacho is set to UTC time. The display you see may be set to something different. You can alter the display, but the tacho will still be on UTC time.

If you wish to show, for instance, an hour’s work done before inserting your card, then select an hour before the time shown on the display.

Since UTC and UK time are the same at the moment, why not change the display? There are threads on how to do it and simulators on line for digi tachos for you to play with, at no risk of cocking up your card.

EDIT…just scroll back up this thread…