I make a short visit to the IOM about once a year and don't get much (ie enough) time for FH while there. I usually bring a list of wills from Brian's index that I want to look at but find it takes me too big a proportion of my available time working out which museum library films they are on (I know the film numbers on Brian's index don't appy).

Can anyone suggest a quick and efficient method for matching the MNHL films to Brian's list, for identifying the right films, or any other preparation I can do in advance to save time?