"We've seen 60 to 70Mbps in the labs on FTTC," she said.

"Is it future proofed? Yes."

The telecommunications company also revealed that ISPs using BT's fibre-to-the-cabinet (FTTC) services will be able to offer broadband packages with assured download speeds of 5Mbps, for customers whose lines can not handle the initial assured minimum fibre speed of 'up-to' 15Mbps

"The option of a lower minimum assured speed for FTTC means that some customers may see an improvement in their broadband speeds compared with the existing speed they receive over the copper network," BT said.

"To be clear - there are now two variants of the FTTC service: one with a minimum assured speed of 5Mbps and one with a minimum assured speed of 15Mbps."