[BBDodge]

The planning permission on the production portacabins expires on August 14th 2012 and the 2 year extension won't be decided until 25th June. CBB will come under that extension but normal BB will have to come under the current planning permission if they are not to be presumptious about the extension being granted. The August 15th CBB launch date (from The Daily Mail) that Sid mentioned would fit neatly into that scenario.

So working from that August 14th (a Tuesday) is the latest possible date for the BB 2012 final. Work backwards from that for the latest launch date.