The Harvey Nichols Birmingham Spring fashion show is just around the corner, and  has proved such a success that this season it will be bigger and better than ever before. And it will be in a new venue. With the last show taking place in The Mailbox Fashion Theatre, there were clear signs that the show was growing in popularity. With this in mind, this Spring’s show will be taking place in the Old Post Office in The Mailbox on Thursday March 21st, the smart industrial space  providing a perfect catwalk for Harvey Nichols Ultra-modern designers and ranges. The Harvey Nichols fashion show always has the most fashionable front-row in…