The Cabinet Office’s Standards Hub explained its thinking on the matter and published the recommendation this week, using the following language:

“When dealing with citizens, information should be digital by default and therefore should be published online. Browser-based editing is the preferred option for collaborating on published government information. HTML (4.01 or higher e.g. HTML5) is therefore the default format for browser-based editable text. Other document formats specified in this proposal – ODF 1.1 (or higher e.g. ODF 1.2), plain text (TXT) or comma separated values (CSV) – should be provided in addition. ODF includes filename extensions such as .odt for text, .ods for spreadsheets and .odp for presentations.”