Originally Posted by
davehadfield
It's annoying having to ask at the desk for Sirius to be activated - negates one of the advantages of Preferred membership. Maybe one day Avis UK will find out what Sirius is & add it to their booking process. It can be done on Hertz UK's website, but for my last trip they came up with something like £120 for a 20-day rental!
Have you tried on the Avis app? Under "my car", there's an "add rental extras" section where I can add SXM anytime after the vehicle is assigned to me.