Two A4 printed paper dilution sheets for 96 well plate layouts, one marked ‘Sample (DNA) Dilution Sheet’, one marked ‘Libraries Dilution Sheet’, both with pen annotations, as used during genetic sequencing of samples at the Royal London Hospital by the COVID-19 Genomics UK Consortium (COG-UK), a group of public health agencies and academic institutions created in April 2020 to collect, sequence and analyse genomes of SARS-CoV-2 as part of COVID-19 pandemic response, 2020-22. dilution sheets 2020-2022