In the UK, it's required by law to confirm the applicant has the right to work in the country [1] - which means checking photo ID, and confirming photos are the same across all documents and look like the applicant.
If that hadn't been done, it's a failing of the hiring process.
However, the ID check would usually be done by someone in HR after the hiring decision had been made, and exchanging photos of applicants is not the norm. So I suppose you could send someone competent to the tech interviews, and swap in the incompetent person at the ID check.