When we were in Suffolk a couple of weeks ago we found these strange incised scratcings on an old church wall and if it is some kind of code we can't make head or tail of it. The harder you stare the less sense the marks make and that's assuming that they made some sense before. We need to get Holmes and Watson in to apply some logic, make sense of the strange marks and then solve the problem. Full marks for the lovely pattern work with the flints too.
High up on an old North facing exterior wall was a plaque that went back to the days of William and Mary and the date engraved there shows 1692, we're convinced that the scratched graffiti pre-dates the late seventeenth century by some considerable time. We're also convinced that particular King of England was killed by a mole while out horse riding, useless information don't you just love it.
After that diversion is it a code or not? All-in-all I think a call to 22b Baker Street is called for.