Hi Jen welcome to Silkysteps.
This PDF from
www.ohcow.on.ca is great -
Safe Lifting brochure - Children, Toddlers, babies and manual handling - it's an excellent source for reference. I'm not sure if it's published in the UK, so best Check it's ok to submit/keep it as evidence.
Slipped disc from NHS direct.nhs.uk
Enjoy the site
Ruth
xx