Read post #17 it was all pointing towards that ...well in my circumstances and obviously confirmed for you as well
.... also if turning wheel left to right and you're hearing the creaking that's dried out upper mounts/insulators .... change the lot whilst your at it or perhaps BC racing coilovers for complete control over comfort & performance

 

Is the creaking noise mentioned above similar to this sound I recorded from my car?" (attach video)

The noise only happens when I hit speed bumps. What is the issue here?