Thanks for the reply – my biggest issue at the moment is whether to include "sales figures" for earlier years... as far as I know, there were no published end of year sales figures before 1994, and the sales published at the time for 1994 to 1996 have since been discredited and revised, so are basically worthless. The figures currently quoted in the articles up to 1996 are usually "estimates" that have been taken from various charts message boards, calculated by enthusiasts from officially published yearly sales figures per artist (i.e. sales could be made up of one or more singles or albums, and estimating what percentage of sales were assigned to each record). As these are completely unofficial and unverifiable, I am thinking to remove them altogether or at least add a note that all figures are unofficial and estimated. In any case I don't think most people are interested in how many records the 37th best selling album of 1987 sold that year – it makes more sense to me to concentrate efforts into keeping List of best-selling singles in the United Kingdom up to date.