The method described in the BS EN 13795-1:2019 (A.3 Treatment of results) to calculate upper and lower quartile results is not well established or available in common software  packages. Consequently SMTL use the Hyndman and Fan (Rob J Hyndman and Yanan Fan, 1996, American Statistician 50 361-365 - PDF) definition 7 method to calculate the lower and upper quartile test results as this is a method commonly used and available in  spreadsheet and statistical software (Excel, LibreOffice, Google Sheets, R and S).

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