Many thanks both - think that I am there now. Started with probing pins which I use for setups - X portion below which should work. Obviously need to repeat for Y. Lots of M0’s at the moment, as, well you know…
M0;Ensure that the probe is connected
M0;Jog the tool above the pin to probe
G10 L20 P1 X0 Y0 Z0 ; Set zero point above pin
M0;Probe to left of pin?
G0 G90 X-10 ; Move to left of pin
G0 G90 Z-15 ; Drop down to probe position
G91 G21 ; Incremental Mode. Use mm
G38.2 X50 F150 ; Probe towards workpiece until touched - up to X50 max @ F150
G91 G0 X-4 ; Move back 4mm from touched position
G38.2 X50 F75 ; Probe towards workpiece until touched - up to X50 max @ F75
;G4 P0.3 ; Wait
$# ; Get latest parameters
%wait
%PROBE_X1=params.PRB.x ; get X position from probe
([PROBE_X1]) ; Print to console
G0 G90 Z0 ; Move back to safe height
G0 X0 ; Recentre bit
M0;Probe right of pin?
G0 G90 X10 ; Move to right of pin
G0 G90 Z-15 ; Drop to probe height
G91 G21 ; Incremental Mode. Use mm
G38.2 X-50 F150 ; Probe towards workpiece until touched - up to X50 max @ F150
G91 G0 X4 ; Move back 4mm from touched position
G38.2 X-50 F75 ; Probe towards workpiece until touched - up to X50 max @ F75
;G4 P0.3 ; Wait
$# ; Get latest parameters
%wait
%PROBE_X2=params.PRB.x ; get X position from probe
([PROBE_X2]) ; Print to console
%newX = ([PROBE_X1]+[PROBE_X2])/2
G10 L2 P0 X[newX] ; Reset X zero (should be directly over pin)
G90 G0 Z0 ; Return to safe height
Thanks all again for the help.