Hi.

There is substantial clunking noise when going over bigger bumps at higher speeds, if going slowly there is no noise, also when going over bumps whilst braking there is no noise.

I have checked everything, but cannot find an issue.

Recently changed drop links and new brake disks and pads. Pads don't seem to be moving.

Any advice?

Might help if you tell us more about your Octavia - engine size & type, gearbox type, version, saloon or estate, model year, etc.

Fixed. It was brake pad moving around.