I had tensioned it the wrong way.... Corrected it this morning, and the belt now looks much better, it still wanders a tiny bit but nowhere near as bad. Took the cam cover off and they are 2wd cams that are fitted and not 4x4. Glad i order them spacers , so cant be that either.

Passed its MOT today thought woohoo. Emissions were bang on 2.5% so at least i know my gas analyser is acurate. Just glad to get some use out of it.

Thanks for all the advice and help