There is not much actually on the A34
Depends what you want.
Greasy spoon? Sit down breakfast? All day breakfast?
If it is at breakfast time - the best place around here is in Woodstock.
The Blenheim Tea Rooms
Quite smart, but pretty much standard, sit down, local cafe.
About 5/6 mins from Pear Tree roundabout off the A34.
Full English, Toast, Tea/Coffee/Juice, as much cereal and fruit / yoghurt as you can eat between servings. About 7 or 8 quid p/p