There should be a plastic Bush that slides over the top of the inner shaft and sits in between the outter and inner shafts.https://www.minispares.com/product/classic/GSV1095.aspx
That's legend thanks! I saw bits of a plastic in there that's all broken. Next thing will be how do i fish out broken bits.....!
Separately, any idea why the trigger tab sticking out behind in steering wheel doesn't engage with the indicator cancelling mechanism? Or do I just move it closer to steering wheel? Indicator mechanism is currently mounted flush with top of steering column shaft.