What Is This Rayburn Part For?

[dilligaf76]

Sorry to be a little bit vague but I was cleaning my uncles oil fed rayburn the other day but cannot find where a angled bit of thin plate about 20cm long goes, I noticed it had fallen on top of the burner and retrieved it when I took the burner out, I put it to one side thinking I'll find its rightful place once I had finished but I just can't work it out!

It looks a bit like the one on the photo with one side longer than the other, please tell me where would it go?

 

[Exedon]

Which model Rayburn?
There are quite a number right from of22 to current models installation manuals readily available on line.
Some on Aga/Rayburn own site others on Harworth heating site.