My 2017 MG has excessive pitting on the rear discs - is this covered under warranty?

When starting my 2017 MG GS from cold the rear pads do not seem to disengage fully resulting in a rubbing/grinding noise until they warm up. I have told I now have excessive pitting on my disks. Can I...

Will the battery go flat if I stow away my MG GS for a month?

Will my MG GS be okay being stowed away for a month or will the battery go flat and will I lose the radio code?