It says a clear national strategy is needed before electronic counting is used in future.

BBC: 'More notice' call for elections

But it raised concerns about the electronic counting system used in London, including the advanced technical knowledge needed to understand and scrutinise the system and errors in transmitting results to the central collation area at City Hall.

BBC: 'More notice' call for elections

There is everything to fight for which is why the precise techniques to be used for counting Americans ended up last year in the Supreme Court.

ECONOMIST: The census

The process is rarely used fewer than 20 times (depending on your method of counting) in the republic's two centuries and depends for its outcome on the political context and the need to muster two-thirds of the Senate for a guilty verdict in the trial that follows the House's impeachment.

ECONOMIST: The misty road to impeachment

That is to say, the procedures should be just as clear, the counting scheme just as thoroughly understood and careful as those used for ballots cast in polling places.

CNN: Major Garrett on election reform recommendations