She is Beth Lily - or Bethany Lily, she's gone by both names in her career. She is one of the bustiest girls on Britain's glamour modelling scene. I believe she still lives in London too. She's a petite, blue eyed blonde girl, with massive 32G boobs and pink nipples. She's been published in Zoo Magazine and many other magazines. Her own website is:
http://www.bethlily.com/
She was born April 24, 1996
Her Twitter is: Twitter: @BethanyLilyA
Her Instagram is: @BethanyLilyApril
Below is a still of her in the very outfit you are showing in that Gif. The Gif is rather faded though.