Well ladies I'm here to report back on my shopping trip to Harvey Nicks!
Firstly, there's 30% of clothes and 20% off accessories in store and online. Whoop whoop! Glad I didn't purchase earlier in the week!
Secondly, I got a dress which I think breaks all of the rules you helpful ladies set me BUT I had the best time with the assistant bringing me dozens of dresses to try and my two DDs causing a bit of havoc in there 
So, what did I choose? Well, 1) it's black (mostly) 2) it's a print! THIS
My reasoning was this: It looks amazing on, really suits my shape, so flattering and really comfortable. It's quite short, even on me, but not indecently so, so it feels and looks "cocktail" not "day" or "office" (or middle-age woman per her classic 'wrap') and 2) I'll get quite a bit of wear out of it, esp. as it feels so good on. I tried loads of stuff, Alexander Wang, Philip Lim, McQ, Kenzo but that one ticked all the boxes. Also I forgot to say, when the passes for the event came, the paperwork said the dresscode was "smart" and went on to say "we suggest cocktail dresses/loungesuits", so I was a bit less comfortable doing sequin for "smart".
So, was thinking the black louboutin courts plus little vintage gucci bag (unfortunately also black...)
What's the verdict? And if you want to accessorise me up from shops I can get to in London tomorrow during my Xmas shop then please do! DH had set me a £550 budget and with discount the dress came in at £250ish - I'm a cheap date 
Oh, and I'm booked for a blowdry. Straight with fringe or wavy and swept fringe? Or up