I did consider PDF and if it the history becomes more than the equivalent of a few A4 pages I will certainly switch to that but we also need to consider how the style of the document fits with the style of the rest of the site. As a relative newcomer to this club I couldn't write the history and the people who have that knowledge couldn't write html comfortably. I have thought about the options and alternatives and for the moment have taken the html output from word and passed it through preprocessors to clean it up and apply the site standards.