Can you explain your situation a little more?
They should have filled out the paperwork but that doesn't render the search unlawful. It certainly doesn't mean anything they found cannot be used evidentially.
The power lies in S18 PACE. The paperwork is just a record for the police and those searched. FAiling to complete the admin doesn't render the exercise of the power unlawful.
I'm very sorry if that is bad news.
Can I clarify anything for you?
The resolution could not have been that he was in breach as that is just plain wrong. He is not. S18 says nothing at all about this form.
Ok. Good luck.