Yeah you’re right they’ve refused it but did have this to say about mileage.
“By the time your renewal window comes around, we will have a more streamlined process in place for customers who require additional mileage, but in the meantime you are welcome to keep an eye on the website for updates on what this may look like.”
Luckily we’re not due to renew until June 2028 so it’s wait and see again.