Any particular reason London to Oxford has been singled out to have so many services cancelled?
Shortage of IETs▸ so cancelling Oxford services was the least worst option rather than cancelling/short form other IC▸ services, particularly SW services?
Goodness knows! On the one hand shelving a load of services to one of your prime tourist hotspots on a Saturday is madness.
On the other you can use some of the spare 387s to operate some of them to/from Didcot (which is
not the tourist hotspot Oxford is, though something I suppose!) and cram everyone on a 2-car Turbo to/from Oxford. Or pack them on a slow sardine can Chiltern service to/from Marylebone or one of the already full and standing through services from Paddington that extends to/from the North Cotswold Line.
Makes a change from culling the South Cotswold Line on a summer Saturday I suppose?