Mine need replacing again and I was just going to get another set from the dealer until I saw they increased up to £50.
Most places will recommend the 21" each side Bosch Super Plus wipers but they aren't the correct fitment, the OE ones are 20" passenger side and 22" driver side. Seems like a small technicality but my experience with the 21" Bosch super plus was that they didn't operate correctly at motorway speeds, for some reason the driver side wiper would start to jump and make a lot of noise.
Some people use Aeroblade style wipers but they are too rigid for the curved windshield and don't fit flush at the corners. They also look a bit crap.
I've just ordered a set of 20"/22" Bosch Super Plus for £13 on Amazon. If they don't fit properly or have issues at speed then I'll bin them and order some from the dealer. They should arrive by Friday so I'll let you know if they work or not.