Using BSC for this final step to agree on a set of ballots again makes sense, as the number of ballots is typically much larger than the number of authorities.
The first round of balloting was inconclusive.
7. IF THERE'S A GLITCH, HAVE A DO-OVER Last year, when a batch of nominating ballots were not delivered in a timely fashion because the post office accidentally sent them as bulk mail rather than as first class, the academy voided all ballots and sent out new ones to every member, along with instructions to disregard the originals.
The first batch of ballots will be sent out to longstanding members from Friday, with a YouGov poll suggesting Corbyn is way out in front with around 53% of support.
"We understand a batch of ballot papers were put in the wrong envelope by somebody working there," he said.
In Ohio, where optical scanners were used in some polling places last year, a five-month audit found that some batches of ballots had been scanned and counted twice.
The good news is, well designed risk-limiting audits, added to well-designed administrative processes for keeping track of batches of ballots, can be efficient and practical.
The margin narrowed on Tuesday, after a large batch of absentee and other ballots were counted.
That lead has shrunk with every new batch of ballots, and after the last update, on Wednesday, Valadao led by just 447 votes.
A initial batch of 340,000 was dispatched on 14 August, and a second batch of 170,000 voters should have received their ballots between 21-26 August.
