Perhaps. But you know what you’re signing for when you sign your contract as a trainee driver.What's wrong with moving if another company is offering you a better deal elsewhere?
I'm sure the people doing the training would move if they got offered a better deal elsewhere.
Maybe the correct view would be "What can we do as a company to stop drivers leaving?"
Just my thoughts on the matter.
And in respect to moving; even as a qualified it’s not an easy task, especially to go to LNER or CC.