Some schools are trialling facial recognition systems to allow students to make contactless payments for lunch.
However, the ICO has said that schools should consider less intrusive ways to let pupils pay for meals.
Whilst there does not seem to be anything unlawful here, the ICO also said that schools should carefully consider the necessity and proportionality of collecting biometric data before doing so.
On a related subject, Facebook has said that it will no longer use facial recognition software to identify faces in photographs and videos.
This is in the face of growing criticism from users, and is ahead of the ICO publishing clear guidance and rules around the use of facial recognition software and biometric data.