Just had a flyer from Screwfix. They are selling a steel storage box of
170 HSS drills for =A317.49 or TiN coated for =A324.99. There are 10 of each 1 - 8mm and 5 of each 8.5 - 10mm in 0.5mm steps.I bought a set like this many years ago in preference to the usual small sets where you get one of each size. Those are fine until you break the one you're using. Then you're stuffed unless you have a second set. Take that logic on and you end up with a box like this.
HSS Part No 53311-01 TiN Part No 66069-01
John