How do I call a UK company with their phone number?

So I’m trying to call about an order I placed with Universal Music (The Major Label) and their number is 0845 070 2036

I’m from the United States. Is there some sort of pre dialing numbers I need to use? For instance in U.S.A. it’s not uncommon to have to press 1–800-before-dialing. Most sites used to list only the 800 number and the 1 had to be pressed prior to dialing.

Any help would be much appreciated!