Commodity Code Clarification

Can anyone guide me on the followings:

The commodity code for importing and related import procedures.

I wish to import the following items to UK from Kingdom from Non EU country from middle east:

Product Name: Potato Crisps (Finished Ready to Eat Product like Walkers), Extruded Snacks like WOTSITS of Walkers. Potato Starch Crisps etc.

Appreciate your help.