Tricity Bendix SI450 electric cooker - how do you set the clock?

On the electronic timer/control panel, the clock button has to be held in whilst the + or - buttons are used to adjust the time forward or backward. For the first twelve impulses the displayed time moves slowly, after which the display alters very rapidly. Slow mode can be returned to by releasing the clock button and + or - button and then resuming setting procedure from the time displayed. Setting the oven timer is more complicated but is essentially the same procedure using the cook button instead of the clock button.