This is one of the familiar two-faceted stones along the Banbury-Warwick turnpike. They are in soft sandstone, easily eroded or damaged, as in this case. This one took a bit of finding! It is deeply buried in roadside undergrowth.
Milestone Society ID: WA_BAWA07
Location: SP 399 497
To find it: A little north of opposite the entry to Splash Leyes Farm
Postcode: OX17 2AZ
Listed Y/N: No.
To find it on the Map: South East Warwickshire