I like Walker Turner stuff ,i have a nice original driverline wood bandsaw.
This might help but it doesnt state what is the slow speed pulley for the drill press.
The speeds for the 60hz slow speed pulley running at 1740 rpm are 480, 940 ,1300 and 2900 on the driverline drill press. Proportionately slower for the UK 50 hz motor i would assume. My motor on the bandsaw is 1440 rpm.
theres a few on US ebay ,if you can find the serial number if there is one on the pulley ,you could compare it to the chart below.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.Xwalker+turner+slow+speed+pulley.TRS0&_nkw=walker+turner+slow+speed+pulley&_sacat=0

Edited By mark smith 20 on 03/09/2017 11:49:29
Edited By mark smith 20 on 03/09/2017 11:50:08
Edited By mark smith 20 on 03/09/2017 11:55:09