Ah, I'm sorry it didn't fix it. Yep it's £60, however they should waver this if you have the car repaired with them. I'd like to hope that there would be some factory good will (factory discount) on the repair bill as the radio shouldn't have failed after 4 years in my opinion. However I'll admit the radio failed on my a6 when it was less than 3 years old.
Sorry I can't help more.
Cheers
Steve