The 400/N400 bus service has changed: it is no longer the U1, and no longer goes to the Wheatley Campus (to be demolished). 

It now extends to Thame, and has been split in two by the Botley Road bridge work.

https://www.oxfordbus.co.uk/services/OXBC/400
https://www.oxfordbus.co.uk/network-changes/c2e3c39a-7998-4464-9373-647a4bc53188