The bus stop location here is on OSM now.

There's only a single PTv1 route (I think) for the X40, so that could do with some work. Apparently, only a late-night variant route goes through Littlemore, 2 buses a day, and it must've been missed off for that reason.

The existing X40 rel, https://www.openstreetmap.org/relation/295458 needs updating to a PTv2 route, and I think it should have 4 variations based on https://www.oxfordbus.co.uk/services/THTR/X40 (commercial, based on open data) and https://bustimes.org/services/x40-oxford-city-centre-westgate-reading-town-cen-2 (open data: even the timetable, I think).

Variants ought to be based on different paths, not different start or end times, I guess (handwave).