For the first time in British Vogue's 100 year history it has allowed TV cameras to film behind closed doors, granting documentary maker Richard Macer unprecedented access to the UK's style bible, its cover stars, designers, and those who run it, as the magazine prepares to celebrate its centenary.

This candid two-part documentary series uncovers the world of high fashion like never before, giving viewers a fascinating insight into an ever-changing industry. Over nine months, Macer gives us his personal observations as he witnesses how the magazine is put together - from the catwalk shows to front cover shoots.

Fresh from the September 2015 shows, we meet Alexandra Shulman, Editor-In-Chief for the past 24 years. Macer follows Shulman and several of the magazine's creative heads, including Fashion Director Lucinda Chambers, who has worked there for 36 years, Creative Director Jamie Perlman, and Editor-at-large Fiona Golfar.

Gaining access to shoots with some of fashion's most iconic figures - Edie Campbell, Mario Testino and Kate Moss, the face of more British Vogue covers than anyone else - Macer soon discovers that neither photographers nor models are particularly comfortable with his camera.

In a significant year for the magazine, with a raft of special events and a bumper centenary issue, the films observe a world not just intent of celebrating the glories of the past, but also facing up to the challenges of an uncertain future. With Instagram and other social media starting to challenge the magazine's exalted position, can Shulman keep it on top?