What makes you think TPG is the one blocking the site? For what reason are you accessing dominos.co.uk from Australia? It is reasonable enough for Dominos UK to block region outside UK to prevent fake orders. They may have not blocked it couple of weeks ago but if they do now, it is completely reasonable. You can always use VPN to get UK IP and access it. There are always ways to get around it if you are smart enough. I don't feel TPG need to help you get around it when other ISPs are even blocked from that site.
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