We have security measures in place at our offices, including CCTV and building access controls.
There are signs showing that CCTV is in operation. The images captured are securely stored and only accessed on a need to know basis (e.g. to look into an incident). CCTV recordings are typically automatically overwritten after a short period of time unless an issue is identified that requires investigation (such as a theft).
We will rely on the legitimate interest basis (assuring security at our offices).