I was after some 6/32 UNC cap screws for use on Tillotson carb bodies recently.
Very good easy service, including posting small quatities etc from Imperial Nuts and Bolts, 25 - 27 Hall Croft, Shepshed, Loughborough, Leicestershire. LE12 9AN.
Search for imperialnutsandbolts.com
Freephone 0800 8 247 294
Apparently they are adding Imperial motorsport bits all the time.
Chris