I don't know if it's the same (probably not) as the Mk1, but for anyone else who needs it.
Select via the "Mode switch" the clock.
press the "Reset button" and the didgets will flash
Press the "Mode switch" and the hours will flash
either hold in or press the reset button to select the correct hour.
Press the Mode switch to make the minutes flash.
like the hours, either hold down the reset button or tap threw the minutes until correct.
press the the mode switch a further time to make the whole clock flash, then the reset to stop it flashing ; and you're done, just select whichever desplay you want to show in the normal way.
Hope that helps someone.