Thanks for the quick reply. The solution you suggested would be a lot quicker than doing it manually, as I am now. I still think it is quite cumbersome, because now I would have to check all the authors in my library for duplicates and spelling of the first name.
I guess I will just have to double-check each reference I insert into my thesis and use your suggestion when I find one that has gone wrong.
Many thanks,
Hendrik
PS: I am not labelling this post as solved, because I am hoping someone has an even better solution 