Have a look at the strut tops. They have a bearing in them and are known to wear. You can see them under the bonnet, check for play whilst having someone turn the steering. Not a huge job but involves removing the struts and coils so you will need spring compressors. They are about £35 to £40 each and it is likely that if one has gone the other isn't far behind.
I think there is a guide to replacing them in the guides section.
Ian.