Since BTR's abortive bid for the company in 1987, Pilkington has underperformed the All-Share by 61 per cent. But its woes are not all sui generis.
Boris Yeltsin remains sui generis, an ardent democrat who has appropriated many causes associated with other groups and factions.
In other cases the process is further advanced and we are getting material which is neither borrowed nor adapted from elsewhere but is television entertainment sui generis.