Forget the Wal-Mart effect, the great and good of the UK grocery world are facing competition from an unexpected new source ­ hereditary peers. Now they've more time on their hands following the Blair purge of the Upper House, their noble Lordships are turning their attention to food manufacturing. Prince Charles started the trend with his Highgrove sausages, the Duchess of Devonshire's Chatsworth farm shop opens a London branch next week and now we hear that the noble Lord Cranborne is planning to start selling sausages produced from Large Black pigs on his Dorset estate. This should cause quite a stir in the waiting rooms at Cheshunt and Stamford Street when coronet-clad salespersons sit down next to the usual reps in grey suits. {{COUNTERPOINT }}