To find this puzzle cache you will have to play my "Historic Hedonism" Adventure Labs, which involves a short walk along Stony Stratford High Street. When you complete the five stages you'll have five bonus codes, A, B, C, D and E.
The cache can be found at N 52° 03.ABB W 000° 51.CDE
Use your phone's native QR code scanner to open this adventure in the Adventure Lab mobile app:
Or share the following URL:
https://adventurelab.page.link/7VX3