QR services sold as BA codeshares on 125 stock:
MMB: flights visible
Possible to see allocated seat: Yes, on QR.com/QR app
Possible to see seat plan: Yes, on QR.com/QR app
Possible to change seat online: Yes, on QR.com/QR app
Online check- in on BA: Yes
Online boarding pass on BA: Yes: self printed, email and Save options
BA App boarding pass: Yes, if the airport is mobile app enabled
Booking visible on QR website: Yes
Seat management on QR website: Yes, see above
Online check-in on QR website: Yes, but most likely on BA.com/BA app if connecting from a BA service first