Thank you for the detailed reply, however surprisingly there has been no knocking whatsoever which is strange in itself. There is still some urethane in the bush that must be stopping any banging. Car hasn't been tracked since these were fitted.
All other front bushes (with Superpro) and comp arms were replaced at the same time as these bushes were fitted followed by full alignment. I haven't hit any kerbs but have noticed over the last couple of weeks it has started to pull to the left, now obvious why.
The failure of this bush has created a large increase in camber from 2 deg at alignment to around 8 deg now. Caster as you say is also all over.
After fitting all bushes and alignment I checked all free play in joint etc and all found in spec. Alignment specs were all in except camber which was 0.5 out due to being lowered.