This is a physical bonus cache for the The Circle line Adventure Lab series: Stage 1 which you will be able to complete after visiting the 5 locations of that Adventure Lab.
You can calculate the final by using the numbers from the letter codes collected from each of the five Lab Cache stages, as follows:
N51 30.ABC W000 10.DEF
Update 18/4/25 - the final has moved to a new location and therefore the bonus numbers have changed in the adventure lab. If you have already completed the Ad Lab you will need to look through the journal entries to obtain the new numbers.
The final is between Bayswater and Paddington stations.
At GZ you will be standing directly above the Circle Line - you'll be able to hear the trains, and feel the vibration from them, as they pass below your feet.
We hope you enjoyed Stage 1 of your Circle Line tour.
You can continue your journey around the Circle line with the stage 2 Adventure Labs and stage 2 bonus GCAWDJF
FTF congratulations go to badstagram