Wifi not working latest mac update

I Have just done the latest software security update and now my wifi does not work I have tried turning it off and on and everything in between but I am having no joy at all. I can access the internet through my phone using it as a hotspot for the same WIFI network the the system just won't let me access the Wifi through my MAC.

Try Wireless Diagnostics.
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
Wireless Diagnostics
Also try turning off Bluetooth.

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