The Greater Cambridge Shared Planning Service (GCSPS) has updated the policies that support implementation of planning applications. What was formerly known as Enforcement is now called Compliance.
If you suspect a breach of compliance with planning then watch the video in the below link.
https://youtu.be/RsfFMB8oKqc?si=bGF1nG6GOXqHWT3B
The video explains what is, and what is not, a breach and explains how you can notify the planning team of a suspected breach.