Chislehurst Road Names - Adventure Labs Bonus

The associated Adventure Lab will take you on a walk to some roads whose names have a connection with famous people who lived here or are significant in other ways. I have chosen roads which are within a small distance of Old Hill to make it possible to easily walk the route - even though it is unfortunately linear and hilly!
There are other local 'famous' road names which are too far away to be included. Bonar Place, toward Elmstead Wood Station is named after previous occupants of Camden Place who were murdered by their footman. Marlowe Close off Kemnal Road is named after Christopher Marlowe, the Elizabethan playwright, who had Elizabeth's courtier Thomas Walshingham as his patron.
Having found all the stages you will have the coordinates to find a bonus cache - scan or click on the QR code below to jump to the Chislehurst Road Names Adventure Lab.
The Cache
The cache is a bison tube containing only a log. The formula for the coordinates will be revealed in the AL.