Our house was built in the late 1990s with underground cable trunk laid at time of build. When we bought the house in 2014 and asked for the VM service, it was easy for two technicians to pull through the cable from the nearest junction box about 200 metres away.
If we wanted to upgrade in the future, from M100 to something faster, perhaps 1Gb, how much work would be required? Would the cable need to be replaced?