There really isn’t much left to be said about Sir Philip Green as his Arcadia fashion empire collapses into administration, taking the Debenhams chain down with it, unless a new rescuer steps in. An aggressive rag-trade wheeler-dealer since he started selling cheap jeans in the 1970s, Green was also once regarded as a brilliant merchandiser — until, it seems, he got too rich to bother keeping up with online competitors such as Asos, rising brands such as Zara and price-slashers such as Primark.