Right folks.
I have the 36V PSU kindly donated by Doddy installed an powered alongside a DIV268N to drive the X axis

BOB connected to the driver as follows:
5V connected to DIR+ PUL+ EN+
EN to EN-
XDIR to DIR-
XCLK to PUL-

I have found the correct 4 wires for the stepper and which are pairs - does it matter which pair is connected to A and B on the driver and how do I know which is + or - ?

I think the only missing thing is the dip switch settings