Mine is a bit creaky too, but rides fine and handle ok. I think my drop links have seen better days, so I might replace them before the next mot.
Other areas to investigate might be the top mounts for the struts, I believe this is a known issue, where the rubber washers perish. Springs, shock absorbers, wishbones, engine mounts, etc. It's all probably a bit tired after 10 years.
If you are unsure, why not take it to a different mechanic you trust and ask for their opinion. If they come up with some nasties take it back to the dealer.
There are some 'trace that noise' videos on youtube, that might help you locate the source of your problems too.