Grassed up....

Although there may be no legal definition of ‘too heavy’ you are more than able to do an individual health and safety risk assessment, if you feel a package is too heavy to lift ‘safely’ then don’t lift it alone, get help or use equipment to move it. You suggested a trolley, a sensible option, Mr He-Man wanted to show off, more fool him. I would point out that you followed the guidelines for manual handling, followed closely by, are you lot paying my wages for today or do I take action against Mr He-Man in the small claims court for loss of earnings and deformation of character?