I was crew trainer at DHL and an official ROSPA approved banksman trainer. Anyone can be trained to be a banksman, whether they drive or not. It is all about understanding the area around you using the simple thought process of T.H.I.N.K.
T = Talk to the driver
H = Has the driver been here before?
I = Indentiffy possible problems
N = Need to concentrate
K = Keep your eyes open
If you have a competent banksman, ie someone who has been signed off by an approved trainer then that is the way forward. But remember in the eyes of the law, the driver is still responsible. If you reversed using a banksman nad run a pushchair over and killed the baby, you would be in court, yes you would more than likely be cleared because you do did everything resonably practicable, and used everything available to stop this kind of incident happening. If you didnt use the banksman, then the story would be very different.
I feel the company is looking out for you and im sure they have only done this to improve their accident rate, and raise their health and safety standard, but it has had a knock on effect that you will reep the rewards of having hopefully zero reversing accidents, and zero potential fatalaties. Reversing accidents when in a residential street are far too often “human” related, which no firm wants you to be part of.