Back in 2010 and 2011 the Openreach overall schedule planning spreadsheets were leaked two or three times. I expect up to date ones exist but the leakers were shot at dawn.
It was clear from those that the planning was by area, where an area comprised many postcodes.
Each area was given a "Phase" in which it was expected to take place. There were no dates given for the phases, though I assume somewhere there were provisional dates for those.
The rollout did prove to follow the phases reasonably well. However, occasionally an area would not be done at the same time as others in the same phase, and although it retained its phase number several later phases could complete before this one. It didn't get a new phase number.
The quarter end dates we see I think initially arose from the phase dates. That would explain the quarter by quarter slippage we used to see, as the re-scheduling of incomplete areas/postcodes, (as some of any particular area might have been completed), would sensibly occur near quarter-end.
Scheduling plus detailed research and planning at the at the cabinet level would not occur until close to the start of the relevant phase. There is no way a national cabinet schedule could ever have been created
, due to the unknown unknowns.
... there are also unknown unknowns -- the ones we don't know we don't know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.
I imagine the reason so many dates, it seems nearly all, have now slipped so much is because of the number of infill and BDUK projects now running. That makes it even harder to give reasonably accurate dates than during the bulk rollout.
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