Farfetch unveils tie-up with Harvey Nichols before ‘£4bn IPO’

High-end fashion website’s expected valuation nears value put on Marks & Spencer

Handbags at dawn with Farfetch, the latest thing in upmarket online fashion

It has a Chinese deal, a Condé Nast tie-up and has lured the founder of its biggest rival – but can it really change the luxury market?