Welcome to East London and a series of new challenges for you to accomplish and find.
The cache IS at the listed coordinates.
In order to qualify to log this cache as a find, you need to find the cache and sign the log, plus accomplish the following challenge:
The green colours of the backgrounds of the numbers in the Difficulty-Terrain Grid get even darker when you reach 26. Find 26 caches in each of the 81 grid spaces on the DT grid, turning every square to a darker green, in order to qualify.
You may use the Project-GC checker below to see whether you qualify. If you wish, you may post a screenshot of your even darker DT grid showing all the numbers 26 or higher.