If you live in the UK, why is your location California?
A #2 is a plain-old pencil. Can also be called and HB. If there is no number on the pencil, it's a #2. Any pencil with a company name/logo on it is a #2.
The only other type that is commonly available is a #3 (slightly harder) and those would have a "3" near the eraser. Softer pencils (#1) and much harder pencils are specialty items that would only be located with drafting or art materials.