I'm 5"6 (167 cm), but I'm not sure about UK sizes... I think I'd be a 10 at the moment (38 european). The 25 B is perfect (crossbody or as a shoulder bag) - and I've seen it on girls taller or more curvy than me and it looks just lovely. It does fit a lot - I fit everything that goes in my Neverfull MM and I don't have to downsize anything. On me 30 looks like luggage! With the classic (not B) she might seem on the smaller side. I've spent so much time before I've decided on the size asking everybody, but in the end, you just have to go to the store and see for yourself. I remember I was shocked when I've asked for the 25 just how small she actually was when the guy brought her, but once I've tried it with my frame, she looked great.
One more thing to consider is that with the classic, you carry her by hand, so the bigger the bag, the more you're going to put in it and therefore 30 might get really heavy. When the bag isn't full, she tends not to keep the shape well and be very saggy. 25 keeps it's shape a lot better and there is no real sagging.
I don't live in the UK, but we also have plenty of rainy weather here in Poland. I got the DE, because I can carry her pretty much all year (I rock mine in summer as well, although I wouldn't mind an azur piece at some point) and not just for 3 months (if I'm lucky) when it happens not to rain... Besides, I prefer DE, because of the red lining and that it's not so "in your face" and I carry my bags to the office.
However, if you're going for preloved, it will already have some patina, so the bag will be a lot more hard-wearing than the new one with virgin vachetta. Monogram is the classic print and you can't really go wrong with it.
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