A quick update, really - new topology!
|Problem, though, is that I now have to readjust all the grille bits.|
Completely reworked the bonnet! There is that one edge-loop at the front of it that's a bit weird, but I've checked with the Subsurf on and it's all fine :D
About to move on to the door panel, there's a few issues with the topology (at least, I don't like it, even if it does turn out fine, which I'm sure it's not)