Can't find preferences for Selling to UK only

To avoid paying unpredictable overseas postage I want only sell / deliver to people in the UK but cannot find the area to set this up. When I go to Account > Site Preferences to find  'Posting and packaging preferences' Posting and packaging preferences is not there. 

The video I watched is a couple of years old, so maybe the section to do this have moved. Does anyone know how I can set it so I sell / deliver to the UK only? 

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