Thanks for clarifying this further. Yes, the "refine search" functionality is visible on the category view, and there you can determine which fields are used for the search itself (including e.g. state/region). By default there are US states pre-filled, however this can easily be edited from the ClassiPress admin dashboard
here by simply replacing those US values with UK specific ones. You can also change the title "State" to whatever is applicable for your country.
The radius search is available in JobRoller on the
main homepage under the actual search fields, and it's available in Vantage in the search sidebar
here. Thanks.