How cold is it? THIS cold. That's fahrenheit, people!
I made sure, this trip, to pack BEFORE I had anything to drink. When we went to Berlin last October, I was slightly tipsy when I packed and ended up in Berlin with one pair of pants and 6 pairs of shoes, 2 of which were sandals. In October? I still have no idea WTF I was thinking, with that, but am pretty sure the rosé had some effect. So now I have a strict 'no drinking while packing' policy. Judging from my past performance, that is wise.
They are forecasting everything from sun to snow to rain in London, so I've packed a fairly brilliant yet compact wardrobe based on the one confirmed fact: it will be cold. Not as cold as here, in fact it will be about 25F warmer in London than here, which in normal circumstances would mean bikinis and a tan. But this winter, it means merely that I will still freeze my ass off, but not as quickly.
Brrr. Just, Brrrr.