They became the hourly 31a. For the record, fbb should point out that "to aid reliability" the 31a eventually became the 31b, omitting Walkley altogether.
The 31 (original and best) remained untouched in route but only as an hourly service. The GoTimetable map shows the development and the present situation.
These blogs are pointedly about the "traditional" 31 but we must not ignore the fact that the route was extended to Wisewood and Loxley.
The evening and Sunday tender was not awarded because somebody (at the PTE? Possibly?) had a cunning plan to save tender money.
fbb will report what is happening at Wisewood and Loxley in due course, but the scheme for the "via Upperthorpe and Walkley" section involves NO REPLACEMENT for the 31!
An hourly service will pick up the 31b route by using a rambling route 135 that chunters up to High Green then buzzes off to Rotherham via Thorpe Hesley and Kimberworth. (click on the map for an enlargement)
The end of an era.
Unless anybody fancies running a commercial 31?