Fibre-building minnows passed nearly one million FTTP connections last year – more than double the amount BT's Openreach managed, according to a report from an industry body.
The report by Independent Networks Co-operative Association (INCA), claimed the latest figures place altnets collectively as the third competitor in new full fibre infrastructure provision, alongside BT Openreach and Virgin Media.
It did not break down which providers deployed the most, although the biggest players are likely to be rural broadband pusher Gigaclear and CityFibre - which aims to coneect one million UK homes in 12 towns and cities within four years.
Earlier this year, Openreach said it was already on track to reach 600,000 full fibre connections under existing deployment plans.
After much criticism for dragging its feet on fibre investment, the incumbent has said it will connect three million premises to full fibre by 2020, up 50 per cent on its previous goal.
Digital and Culture minister Margot James said: