ILR Employers Letter - HR or Line Manager?

Hello All,
This is my first post here, and basically need some advice from the experts! I am due to apply for my ILR next month (WP route).

I have noticed that everyone is getting the employers letter from the HR department. Can I get this letter from my line manager instead? This is because HR are at the end of a phone in my organisation and do not understand the requirements re: SOC codes etc. Whereas, I can speak directly to my line manager and show him the UKBA occupation codes document.

Will this deviation from usual HR letters annoy/confuse the case worker?

Thanks in advance!

The letter comes from, and is written on behalf of, the company (the entity that is employing) rather than a dept. or individual. However, obviously some companies have departments or individuals that are authorized to emit letters on the company's behalf. You have to make sure that whoever writes your letter is permitted to act in this capacity. If your line manager is a person with authority to emit letters on the company letterhead relating to official company matters, and is willing to do this, then that should be fine.