We’re 15 minutes into our interview when the big-ticket item on Siro chief executive John Keaney’s horizon enters the conversation: “Carrigtohill was actually, we believe, Ireland’s first fully fibre town. And I think that’s just a precursor to move us into, if I’m looking forward, copper switch-off – Eir switching off all their copper.” Siro, a 50-50 joint venture between ESB and Vodafone, develops and runs fibre networks all the way to homes and businesses. Keaney takes the Co Cork town to illustrate how connectivity upgrades are gradually reaching all Irish addresses. Some premises in Carrigtohill already had high-speed broadband…