When I changed the drop links today I noticed all the splash guards under the arch are really loose and rattle really much, are they all this loose or should I replace all the fasteners?? Also my front wheel arch lips have holes in them, are these for some kind of wheelarch extensions or something.

I know the splash guards should have very slight movement. But sounds like they are too loose how you have put it so would look at getting the tight end up. As for the holes my guess would be like you have said some sort of extensions. 

yup what Gambit said

 

is it worth posting a couple of shots of the holes in the lips?

Ill do some pics when I get a minute, at work today :-(

No rush - we're planning on going anywhere - its persisting it down by me so not the best for taking pkotos :)