Clifton Lock Mystery Cache

SAFETY INFORMATION: During periods of heavy rain there is a risk of flooding along the Culham to Clifton Hampton section of the River Thames. Before setting out, we recommend you check the current situation at Flood Warnings.

This is a simple puzzle that you can solve at home.

According to Wikipedia:

Clifton Lock is ABC feet above sea level.

It was build in 1DEF

It is GH miles from Teddington

The cache can be found at:

N51 CD.H(A+B)B W001 AF.(G-A)(H-G)(H-E)

Access to GZ can occasionally be restricted due to high river levels. So during winter months in particular it may be worth checking the Environment Agency website for the latest information.

You can check your solution at:

*** Congratulations to happy_hunter_hp20 for an intrepid after-dark FTF ***