The starting point is the car park for Badbury Clumps car park, an Iron Age Hill Fort.
The hill fort was constructed around 2500bc and still occupies a lovely location of about 9 acres of hill top. Unfortunately, much of the hill fort itself was destroyed in the 19th Century. More information about Badbury can be found at this web site.
The main car park is at N51°38.944', W01°37.405'.
Please check out the Geocaching Association of Great Britain offering support for Geocachers in GB.