Manual for a Belling cooker ?

I have bought a second hand Belling cooker, Gas top and electric fan oven. Need to find which model this is and how to reset the clock. I think date of man. is 1990. The clock is oval on the left of the control panel with 5 buttons below it. The main oven has a glass front but no light inside, and the grill does not have a glass front.

Can anyone help ??

Regards.

David