Right then, managed to get hold of a Fabia rear wiper arm and end cap, sorted... went to local motor factors to get a 15" blade, non of them would fit.... to be honest, all they had were 'Valeo' and 'A1' wiper blades (not much choice) but they would not clip into the arm, either the fitting on wiper was too small (Valeo) or was too wide to fit inside the arm (A1)... which ones do people have fitted on their Fabia wipers....??
Will take a trip to Halfrauds.....