Ok, the knocking/ rattling over bumps has been self diagnosed!
I completely removed the front sway bar, and now there is no noise whatsoever. It also feels a tonne softer to drive in a straight line (which seems odd to me...).
Going around corners is definitely a bit more "Bargey" and I do miss that amazing instant steer in feeling. So now the question, are the culprits the sway bar bushes, or the tie rod ends (is that the right name for them?)?
I now have a feeling that the sensation of "harsh suspension" could be very tired suspension that actually isn't doing its job and is dumping over the harsher/ bigger bumps. So yeah, very confused right now, and I wish I had someone else's car to compare it to...