In message <s5hoh5$79k$ snipped-for-privacy@dont-email.me, NY snipped-for-privacy@privacy.invalid writes
No :-) Road numbers have changed a lot over the years, have a look at the original (1920s) route of the A42 and the A66 as but two examples.
However, looking at my early 1970s AA road atlas, the Oxford - Banbury road was the A423, the A34 was the Oxford - Stratford (almost via Chipping Norton), and the A44 was started where it left the A34 (near Chipping Norton), and headed in a generally westward direction.
According to Open Street Map, the A44 now runs from Oxford over the route of the former A34, and from Chipping Norton, the old A34 is now the A3400. Oxford - Banbury is now the A4260.
Adrian