Location Services stopped with 10.11.4 fresh install

I completed a fresh install of 10.11.4 only to find that Location Services are no longer available (Maps, Weather, System Services). I've toggled "Enable Location Services" off and on numerous times in an attempt to activate the service but still no joy. In the Time Zone panel, selecting "Set time zone automatically using current location" immediately gets an "Unable to determine current location at this time" error.

My other computers running 10.11.4 (they were auto-updated from 10.11.3, i.e. not a fresh install of 10.11.4) don't have this problem and still have access to Location Services.

Has anyone else experienced this problem and found a solution?

TIA