Parking Wars is a series of geocaches all in or very close to major parking lots in the city of London. The caches all have some kind of unique twist and are more than just a classic LPC, although I do enjoy those! 
This bonus cache is not at the posted coordinates, however it is within 1km. In order to find the location of the cache, you must find all three other caches in the Parking Wars series. Inside each of the three is a bonus code word, the 3 Words will ultimately help you find the final coordinates. The difficulty rating is for the total time and effort it will take to complete the series and find the correct coordinates, and not for the bonus hide itself.
[GCAAZ37] Green Energy - Parking Wars (1)
[GCAAZ48] The Circle of Life - Parking Wars (2)
flooding
[GCAAZ4G] Gold Nugget - Parking Wars (3)
This cache name is inspired by Bernice, a character from the TV show 'South Beach Tow' played by Lakatriona Brunson. Her character often defied death. Always be careful where you park, or someone like Bernice may just show up! 
There are many components to this bonus cache, so if you are having problems or something seems to be missing please don't hesitate to reach out. Try to be stealthy while completing the series and replace everything how you found it.
Congrats to JohnnyC_64 on FTF!
You can check your answers for this puzzle on GeoChecker.com.