A variety of factors have contributed to the project's completion date being moved back to 2010, according to its client and contractor.
The BBC confirmed this morning that the cumulative effect of various hiccups had taken its toll on the project's date of completion.
These problems involved MacCormac Jamieson Prichard being dropped from the second phase of the scheme and replaced by Sheppard Robson.
A BBC spokesperson said that further reasons for this delay included the departure of a cladding subcontractor.
And a spokesperson for contractor Bovis said that changes to the project's design stemmed from requested design changes by the BBC.
The BBC official concluded: 'It's no surprise, it's the biggest development project in central London.'