Marple’s Seventeenth Lock — Adventure Lab Bonus
This cache is intended to be solved while visiting the locations of the accompanying Adventure Lab:
"Spans & Staircases in Marple"

Link to the Adventure Lab "Spans & Staircases in Marple".
When completing the Adventure Lab you will visit significant sites from Marple’s rich industrial history and at each location in the Adventure Labs mobile app you will be prompted to answer a simple question. Answering correctly will reveal information to help you work out the actual location of this mystery geocache.
There is also a field puzzle to solve before you can get into the container to sign the log and claim your find.
Once you have answered all the Adventure Lab questions you will know the numbers behind ABC, DEF and XYZ. Use the following formula to reveal the final coordinates:
N53° 2 4 ● A B C W002° 0 0 3 ● D E F
You will know what you need the numbers XYZ for when you get there!
Tweezers may be needed to extract the log sheet. Please note the cache is not at the listed coordinates and you will find nothing there. The coordinates are for a car park where it is recommended you start your adventure, though on-street parking is available near every location. Whether you are walking or driving between locations, if you wish to solve and find this bonus geocache without excess travelling then please visit "Top of the Stairs" and "Iron Bridge" first.
We welcome logs highlighting any issues that detract from the quality of the cache or any suggestions you have to improve it. Good luck everyone!