Generally, internal trim items are only covered in the first year of the warranty.
Not sure with MG cars ?.
We found this out once, when we owned a brand new Vauxhall Corsa ( wife's car ).
The plastic hinge on the rear parcel shelve failed and the parcel shelve itself, would try to attack you in the face, when you lifted up the tail gate.
The car was only 13 months old and the warranty claim was rejected under the T&C's !.
I was directed to the stores department, by the service receptionist.
The good was, that the new plastic hinge was only £11 and screwed into place with three screws and was fixed in about 5 minutes flat.
Get it booked in ASAP and while you are waiting for the parts, you will have plenty of time to check through the T&C's of the warranty.