Thats handy to know. Thank you. The RS components pots are £2.50-ish compared with £5.00 on ebay. Im lucky in that I have an RS shop not too far from home,so can nip in and pick parts up.
Ive also a small independent electronic parts store about 4 miles from home,so Im going to check them out too.
The one shown in the link to RS is smooth shaft, so you want the knurled shaft of course. Seems like they stock those as well. Bourns also makes audio and linear taper. If they don't have what you need, good chance they can special order them for you.