They did indeed use Excel to process the data. They could have possibly used a more recent version of Excel but saved the data in the legacy file format anyway.

They did indeed use Excel to process the data. They could have possibly used a more recent version of Excel but saved the data in the legacy file format anyway. https://www.bbc.co.uk/news/technology-54423988 https://www.bbc.co.uk/news/technology-54423988