Agency staff DO NOT get used as shunters. This is a safety critical role with huge responsibility. It takes considerable training. Sometimes the GBRf drivers will couple their own train up to help the shunters. Not often though.
As has been stated in a previous post, Agency Staff are used at Aberdeen.
At several other locations Freight shunting has been "out sourced"
It is a sad fact that these things are happening in the continual "race to the bottom" for terms and conditions in the privatised rail industry.
Many vacancies go unfilled and the jobs are filled on a week to week basis by staff on Part Time and Zero hours contracts, paid less than going rate for the job.
They are properly trained and competent, but remain what we would, in the past, class as "Agency Staff"