Exactly what kept happening to me. I also refreshed the page at about 9:57 a couple of times but the tickets still didn't show on sale for me either. It's so bloody annoying that they were only available on one site. I found it weird that gigsandtours was advertising, and then it still took you to Ticketmaster! Odd!
Edit: On the O2 Academy ticket page the listing says sold out. Yet I still find myself refreshing the page, just in case...lol I don't really do social media, so I'm going to rely on you guys posting any updates about new shows!