Link to news article including statement from BT
http://www.thinkbroadband.com/news/5818-bt-retail-in...
IMPORTANT: Should only be affecting some BT Total Option 1 customers, though does appear that will be rolled out to more as time progresses.
An FAQ on how to identify whether you are on the pilot:
http://btsupport.custhelp.com/app/answers/detail/a_i...
If there is demand we may add a tool, or something to our speed test to identify connections that are affected. Currently the IP Block that seems to be handling the CG-NAT customers is a 31.55.248.0 to 31.55.255.255