Question;- Has your Job description changed? If it has - legal obligations may have changed If it hasn't - no change to obligations - BUT, do you know what they are anyway?

Are you in a staff job or contract/freelance? If staff, it should make very little difference as your employer remains responsible for your actions. Vicarious liability etc Also to ensure you are trained for the job.

As you are trained to Dip level it is probably reasonable for you to be in a safety managerial role and maybe your employer feels you are being under-utilised. Loss control advisor to me indicates a fairly narrow area of responsibility whilst team leader s&e indicates a broader area including more of the risk management function and also including some staff management responsibilities. Why not ask them what the changes mean (and how much it means on payday)?