Updated. Looks like it rejoins the main carriageway at the point it goes from new nice segrgated stuff to old crappy shared use stuff. My position for that litle cycleway=link is pretty inaccurate, and done from memory (I had to hurry back to take care of my mother)

The speed limit has dropped from 40 to 30 too (may need a further check). There are sighs up about it further towards Oxford than those in the picture.