IMac and Macbook Pro no longer connecting to the Wifi?

Hi there,
I've been in London this weekend, only to return home to find issues connecting to my wifi. Weirdly, it's only the iMac and Macbook Pro having trouble, everything else is connecting fine e.g iPad, Phone, Android Tablet etc.
I'm getting disconnected around every 20 seconds and cannot figure it out! It's so frustrating as I'm wondering if there's been an update released for OS X that it has downloaded recently? Especially seeing that when I run windows from bootcamp on my iMac, it doesn't disconnect. And I also don't believe it's an issue with the hub.
Has anyone got any suggestions? I've tried removing the network and re-adding, help for about an hour but still not much use.
Thanks, Matt

Wi-FI connection drops
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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IMac and Macbook Pro no longer connecting to the Wifi?

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