The purpose of this video is to create an emotional response out of the most basic and bare elements. A badly exposed picture (that London weather is tricky to photograph) and a handful of loops.
The original picture is treated originally in Photoshop and then sent to cinema to create the actual animation.
AfterEffects is used to add all the effects like depth of field, snow, text treatment, some camera movements and finally colour grading.
GarageBand was used to sync the video to a series of loops.