Slightly off-topic, but Stagecoach has revealed its new timetable for the Oxford Tube from Monday 6th January. It is quite clearly a response to the withdrawal of the X90.
The PVR will increase from 25 to 31, to cater for the increase seven Van Hool Astromegas are being transferred in from Stagecoach West Scotland where they have recently been displaced from Megabus work - the vehicles are reported to be 50233, 50235, 50244/5/6/7 and 50250.
The new timetable features "express" journeys. These will operate via Marylebone and will not stop at Notting Hill Gate, Shepherd's Bush, Hillington Station or Lewknor Turn but will serve the former X90 stops at Marylebone and (on request) White City. These journeys operate at certain times only and are clearly aimed at commuters and the tourist day trippers. In effect they are timetabled relief journeys - which is hugely ironic, as that was how the X90 came into being in the first place!*
https://www.oxfordtube.com/extuploads/oxford_tube_from_06_january_2020.pdf
*
at the time numbered 190, the route commenced in the late 1970s as timetabled express relief journeys along the newly-constructed M40 motorway, supporting the traditional COMS 290 and 390 routes between Oxford and London. The route quickly proved popular and soon became a regular-interval service.