thanks Mark,

new readings, male jack inserted,

ground pin (1) under jack / pcb.

to ...
earth / screw 2......... 16.4 k/ohm
pin on male plug 3....... 3.2 ohm
coil 4........... 16.4 k/ohm
coil 5......... 16.4 k/ohm

from side pin

1-2, 9.9 k/ohm
1-3, 26.3 k/ohm
1-4, 9.9 k/ohm
1-5, 9.9 k/ohm

male jack not inserted...

from underside pin,

1-2, 8.7 k/ohm
1-3, 3.1ohm
1-4, 8.85 k/ohm
1-5, 8.85 k/ohm

from side pin

1-2 8.82 k/ohm
1-3, fluctuates 13-14 ohm
1-4, 8.8 k/ohm
1-5, 8.8 k/ohm

thanks again,

replacing the plug shouldn't be a problem,

Hugh