There is nothing to find here, but there is a supermarket car park.
This is the bonus cache for the Going Potty About Hornsea Adventure Lab.
To do this you will need the Adventure Lab app from either App Store.
Use your phone's native QR code scanner to open this adventure in the Adventure Lab mobile app, or share the following URL:
https://labs.geocaching.com/goto/e4a7
Once you have completed the adventure lab, check the final journal entry for the bonus.