This cache is a bonus cache for the 5-stage Closes of Lanark High Street adventure lab which can be played at the following link:
Play "Closes of Lanark High Street" here!
The final cache is located close to the final stage of the adventure lab (hence the locked order) so the entire thing shouldn't take too long. GPS coordinates may be inaccurate at the final GZ due to proximity of buildings.
Please bring a pen/pencil to sign the log and use stealth when finding/retrieving the cache.