I purchased two new wiper blades from an automotive aftermarketsuppliers (Parkinsons) Grimsby.
I got a Bosch 24' blade with a spoiler and a 15' Bosch Normal blade for the near side. You can fit a 15' blade as there is plenty of room for one, and you get that bit more area covered, and it really covers the sensor. At the time I got discount as I worked for a local company, but anybody can ask for trade. I think I payed about £9.75 for the pair.