It could be aggressive advertising, known as AirPush and similar.
The app which had created that mess might be still on your phone ... recently installed or updated.
To find that culprit app install an AirPush detector like Lookout Ad Network Detector
Thank you so much! I installed Airpush Detector and it detected about 10 apps that were sending push notifications. Have uninstalled them so will see if I get any more ad's now.
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