Hi, I did a diploma and got an email asking for my personal development over the last year (courses I'd attended in the last year i.e mentorship, ILS, ALS this included mandatory training)! This may not be the same for you but I hadn't done any modules since 2005! I just got them signed by a nortuary and sent them!
I think People are talking about the HR letter that has to be signed by your manager or senior management! My manager did mine for me so she did add a bit more so it looked more like a reference, could you go to your senior manager in confidence that she doesn't tell anyone?