As I needed to look into war diaries of NW Europe campaign, I built myself a list similar to the ones from Drew. (It involved several several searches, some copy/paste and a touch of Excel to make it usable and remove duplicates) Beware! This list is not complete. It includes ~5500 items, equivalent to 50% of the WO 171. There are random gaps everywhere, but probably enough items of each main unit to make it a convenient aid. I recommend to use filters or a pivot table to spot the unit you're interested in.