Hi Danny,
I had endless problems with knocking/thumping over bumps with my 1.3 Multijet Dynamic and had the steering rack, anti-roll bar, shock absorbers and mounts replaced in attempts to overcome the problem. Please see for more:
https://www.fiatforum.com/grande-punto/123727-thumping-over-bumps.html
Eventually I sold the car back to the garage but I think the nearside wheel bearing had failed. If I went fast around roundabouts a grinding noise was eventually replaced by a grating noise like the disc rubbing against something.
Good luck!
Mike