Senior Undersecretary to the Minister for Magic

hello everyone, I'm currently working on maternal matters' 3rd chapter, and I need a tad bit of help, I just need to know two simple things, 1, who was the undersecretary before umbridge, and 2, who was the court scribe before percy weasley, i need peiple who were or could've been in these positions on the 2nd of november 1981, and of course, I thank all of you in advance for your answers