Thanks for your help Fraser.
Just to reiterate, it won't affect everyone, but clicking on Ad within the the Google Adwords Admin area will not reveal potential problems.
You'll have to click on your own actual ads on Google Search.
If unsure, a safer option maybe to make sure it is switched off, as this corrected the problem.
My Account > User Preferences > Scroll Down to Analytics
and make sure it says
Destination URL auto-tagging: No, thanks
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