So if you see it don't get too panicky, it's probably a result of the previous complaints - Openreach are playing it ultra safe.
Address xx WARREN ROAD, TWICKENHAM, TW2 7DJ on Exchange KNELLER HALL is served by Cabinet 21
WBC FTTC Up to 75.7 Up to 20 -- 31-Mar-14
It'll be ready by May 2013.
This is inconsistently applied so far, so be aware:
Address xxx CHURCH STREET, TWICKENHAM, TW1 3NJ on Exchange TWICKENHAM is served by Cabinet 36
WBC FTTC Up to 69.3 Up to 20 -- 31-Mar-13
This was delayed for the same reasons and will be built at the same time approximately as 21 Kneller Hall but checker still claims March.
Either way do not panic too much - it's a placeholder date on steroids!