Bit the bullet and bought the Turner spherical bearing kit, decided it was worth a punt since they have the lifetime warranty.
Kit arrived yesterday and I spent this morning putting them in, out with the arms and pressed the old bushes out,
new bushes ready to go in, first one went in no problem, second one took a couple of tries to get it started square but went in fine,
arms go back in as per usual, but hardware can be torqued up with suspension droop as the mono ball just pivots when the weight comes back on, so nice and easy, will book for wheel alignment and WOF re-check next week.
Now, to see how long they last....