This is a Bonus physical geocache for the very short Small Plants in Abergavenny AdLab. The cache is not at the given coordinates - to find out where it is hidden you need to complete the AdLab. I usually dislike Sequential AdLabs, especially when they march you from pillar to post around a large area, but this is such a short walk that you should be able to pick up all the stages quickly and the Bonus isn't too far away from the fifth location.
The AdLab is deliberately easy, with multiple choice answers in most cases, and I hope that people will find it interesting.