We were visiting Kent today. I had dropped my wife off at Bluewater and so had the rest of the morning to myself to do some caching. I decided to first grab a few puzzles and then these Numbers Challenges.
The CCTV cameras continued all along this section. I had a quick look at the hint and realised I had to be standing right next to the cache. So I reached across and there was the cache.
My profile is publicly viewable but I'll attach a screenshot anyway.