I was thinking she takes the ideas that Westwood has often used - i.e., riffing on UK/Royal traditions, as Scott mentions - but she makes those her own with this collection. I mean, the cuts/frills/embellishments are very much her own (Westwood, of course, being more about bias cuts, asymmetry etc) but in their allusions I see similarity. Not that this a bad thing; it's great!
I love the tartans; I'm a sucker for tartans...