Have you ever wondered what happened to the Sloane Ranger of the 1980s? She didn't just have one gin and tonic too many and drop off the face of the earth, she moved to the Home Counties with her investment banker husband and in between polo parties and walking the Labradors, she has been carefully propagating the new breed. Take cover, the Rah is taking over.  Oxbridge rejects swamp university cities such as York, Edinburgh, Bristol and Leeds in a flurry of blonde backcombing and Ugg boots. However, they no longer represent the monoculture they used to; they're evolving and branching out.

First comes Posh Rah. She has stayed close to her roots. Easily identifiable, these girls are normally blonde, regularly manicured and sporting a pearl or two and a sparkle of Tiffany silver. Popular 80's Sloane labels such as Barbour and Hermes still prevail but are interspersed with a touch of Burberry and the occasional Jack Wills or Ralph Lauren polo shirt.  Though thoroughly traditional, Posh Rah has put her own twist on things, replacing the traditional headscarf, the silk scarf is now to be worn tied to a bag or through belt loops. The pashmina is the accessory de jour, usually pink and worn with everything from the staple padded gillet to hoodies.

Dressed down Rah is a common spectacle at University, normally appearing only for afternoon lectures and more than likely still in pyjamas. The uniform for these guys is pretty unisex, polo shirt or large jumper, jogging or pyjama bottoms and Uggs or Flip-flops (to be adjusted according to season) Although I'm all for weird outfits, there is nothing weirder or in my opinion more wrong than a man in Uggs, I was hoping that it would never take off but there's already a portmanteau: Muggs. It is too late.

Dirty Rah is my personal favourite. Rejecting the traditional preppy look, Dirty Rah favours a more individual look, wearing clothes just as expensive as Posh Rah but you would never know. Backcombing hair has developed into an almost dreadlock state of neglect, these girls are not so much Wash and Go as Wake up and Go. There's a traveller vibe about them, well they do commute between home in London, University and the holiday home in Fowey with great regularity. In a queue for a sandwich at University I was behind a girl, knotty hair, homemade denim shorts, holey jumper and purple Doctor Martins, looking like someone who had crawled in to buy a can of special brew. And then she whipped out the Gold Amex to pay for her vegan sarnie. Do not be deceived by these great unwashed, they've got more in that handbag than you may expect!

Chav Rah is a new and worrying outsider threatening the security of the Sloane dynasty. The popularisation of this style has been great for brands such as Jack Wills and Abercrombie and Fitch, selling cheap and highly labelled merchandise can always turn nasty. These brands are almost reaching saturation point, young girls, particularly those of college age, can't resist and the high street is in danger of becoming full of Jack Wills clones. Once the look gets into the wrong hands it can be disastrous not only for the label but for the look and its followers. Two words, Daniella Westbrook. I fear it's all about to get a bit Burberry.