I'm a driver at Tramlink, and having chatted to the last lot of trainees that came through the system, most of them waited two years for a vacancy and applied through the First Group website.
If anybody was getting in through any back door, then I'm sure there would be some loud complaints to the Union about this from the drivers !
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Ok, I have to back track a bit.

I forgot two of the trainees were already working for Tramlink in the Croydon travel shop, so they were internal applicants.
However, they still had to do all the psychometric testing and Manager interview.