What actually happens to the biometric data after your trip is over? I can understand keeping it for a length of time. But one scenario where this could be a pr

What actually happens to the biometric data after your trip is over? I can understand keeping it for a length of time. But one scenario where this could be a problem is if you did not agree to share this biometric data with another country, but that country requests it from the UK who happily complies. Another scenario is the one where the data is leaked because of a security issue and it enables you to be tracked with facial recognition software because your identity was tied to it. Although it's still possible to track someone without an identity and it's possible to get an identity without needing leaked government data, I still would consider this data very sensitive.