When I read it initially yesterday, I started to think it was just me. 
Maybe I'd rushed through it or hadn't read it properly. 

Maybe I was starting to show symptoms of a degenerative disease! 

Thanks for reassuring me that it's none of those things. 

Some unusual changes. With the 25/22 renumbering hidden away as mentioned by others.

The end of an era! It's been the 725/X25/25 for as long as I remember.
Renumbering it as the 22 is maybe a subliminal attempt to try and link it with the 21.
It will probably take more than a change of number and some comments hidden away in an irrelevant service change piece to do that though.
Shared timetables? A paired brand?