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Both King Pin bearings and seals have been replaced and although the 'wobble' was much better it was still there at 45mph - I purchase a 'shim-kit' and a set of front wheel bearings from Martin.
I took it all apart this morning and decided the wheel bearings were fine. I followed Martin's instructions and fitted shims to the Kin Pins, I used .5mm on both the top and bottom offside king pins and .2mm top and .5mm on the bottom nearside king pins.