BT, the £22bn UK telecom giant, has faced intense pressure from alternative network providers racing to capture fibre customers. With over a hundred altnets including CityFibre and Hyperoptic reaching 20mn homes across the country, BT's copper-line business hemorrhaged customers as traditional revenue streams dried up. Despite a 15% five-year decline, the company is mounting a serious counterattack.

Between 2020 and 2030, BT will invest £15bn building out its Openreach full-fibre network, showing commitment to the fibre future. The strategy appears to be working: Openreach lost just 203,000 subscribers last quarter, better than market expectations, with projected losses of 800,000 lines for the coming year. BT is accelerating copper-to-fibre migrations while competitors struggle with funding constraints.

Altnets now build 40% less infrastructure than in 2025, according to Goldman Sachs, as cheap capital evaporates. Most require more than double their current 19% market penetration to break even. BT's infrastructure costs run roughly half what altnets spend per household, giving it a structural advantage. Shares now trade at 13 times forecast earnings, narrowing the gap with European peers.

Analysts project revenue growth from 2030 as the fibre rollout matures. After years battling insurgent networks, BT appears to have gained the upper hand in the UK's broadband transformation.