Cerberus offering it to customers. BT fell a little behind schedule but will cover several hundred thousand homes with G.fast this fall. 10 million are promised by 2020. The retail ISPs are now active, with Cerberus offering the service on its web site.
"Up to 330 down, 30 up" costs 90 pounds including VAT, $117. "Up to 160 down" costs a little less. BT's fiber home is actually a bit cheaper.
Cerberus reports, "BT will only allow an order to be placed where the availability checker states that the predicted speed is 80.01Mbps or higher." The reach is estimated at ~300 meters.