‘Platinum’ Route numbers

[MasterPlan]

I didn't say there would be, just stating facts. I understand the reason for the X prefix - when the routes were first introduced  they were planned to be limited stop to the QE but that was changed almost immediately. As regards them being busy and direct, so are the 61/63 to Selly Oak and Northfield, the 50 to Moseley and Kings Heath etc but that's different to being an express route.

If they do ever change these in a future network review, renumbering to 21/22 would be an easy transition.

The chance to do so was when the X20 disappeared. Should've renumbered them to 21/22 then when all the flags and branding needed re-doing anyway.