The only issue I can see is that digital region had to replace some line cards at the CAB as the current ones only supported 70-80meg.
Most (If not all) of the Line Cards installed on Openreach cabinets are Profile 17a which are (Per specification) capable of Up to 100Mbps downstream.
A Cisco document I looked at a few days ago for a VDSL2 WAN Interface mentioned a
combined data rate of 17a to be 150Mbps; which I'm assuming is 100Mbps down and 50Mbps up.
So I'm guessing BTw could raise it to that if they wanted too, but I'd like to think they are looking more into Vectoring first...
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A.K.A: Chrisszzyy
Telewest (2004-2006): 256Kbps -> 512Kbps
University of Portsmouth's Horrible Network (2013 - 2014) - Supposedly 100/100Mbps
BT (2006 - Present): 8128/448 -> 22494/1211 -> 79987/20000Kbps (BT Infinity 2 on Huawei Cab)