Try looking on this link: http://fttc-check.alc.im/
If you put in your post code it shows you which cabinet you are connected to and whether it is enabled for BT Infinity. It’s based on data from December 2011 but it shows whether the cabinet will be enabled as part of a phase.
A property that is for sale on RightMove on Main Street shows as enabled whereas properties on Ascote Lane don’t and aren’t part of a phase.