LAME Imposter.
As a retired engineer who has worked in a number of positions in a large and small companies around the world only once haveI known of a situation where an 'engineer' has been allowed access through the system when his licences were not observed on being given the job! He lasted 5 mins when QA interviewed him!
QF have ex LAEs who become managers within engineering and also those who have responsibilities with QA .Surely they must see new engineers before they ever get near an aircraft!
A licence or approval number must accompany a signoff . If an authority was given on a bogus or a forged licence this is another matter which could be part of a wider problem if a foreign licence can be forged. But it is a brave person who can manage to set themselves up that way then try and pass as an 'engineer' given the international nature of aviation today .What approvals or licence did this guy have?
Usually experience ,history and reputation of individuals can be pretty well known, especially in UK!
The outcome of this will be interesting !