Kate Orman and Jon Blum

Kate Orman is an actual female girl who likes Doctor Who, talked about it online in the 90's, and even contributed to the Virgin New Adventures and other lines of novels. She's famous for creating believable characters, deepening the regulars by putting them in tough positions, including references to silly fandom debates, putting pyramids in all of her books, and having actual female girl boobs.

In the mid-90's, Jonathan Blum won the online "Marry the Girl Doctor Who Fan" competition, so he got to not only move to Australia and touch her actual girl boobs (as long as he's willing to dress like the Eighth Doctor), but also co-write most of her later books.

The Left-Handed Hummingbird Seven, Ace, Benny Turns the angstfest of the early VNA era into actual psychological fiction, and tells a complex story that manages to all hang together. A bit of first-novel syndrome, as she uses every trick you learn in writing seminars, and Space Bitch Ace is still annoying, but still a good book.
Set Piece Seven, Ace, Benny A torture-the-Doctor book that actually manages to reveal more about the characters instead of just being Lyons/Mortimore torture porn. Also manages to finally turn Space Bitch Ace back into a real character again, and make Kadiatu Lethbridge-Stewart interesting.
SLEEPY Seven, Benny, Roz, Cwej Not quite as deep or intricate as her other books, but makes up for it by being fun, and by finally showing the other writers how to use Roz and Cwej.
Return of the Living Dad Seven, Benny, Roz, Cwej A playful book about racism and child abuse and how season-24 Seven was really as dark and sinister as season-26/VNA Seven that shouldn't work at all, but almost does, although it ultimately comes across as a manifesto for "being nice is good".
So Vile a Sin Seven, Roz, Cwej Ben Aaronovitch lost half his novel in a hard drive crash and, rather than redo it, he handed it off to Kate to finish for him. It has to tie up all the character arcs of the VNAs so that Lungbarrow can happen. It came out after a bunch of books set later in the timeline. You'd think all of that would make it a mess. And reading it, you constantly see how it could have been a much better book with a little more time, but it's still good.
The Room With No Doors Seven, Cwej The last one wrapped up all the character arcs of the VNAs so Lungbarrow can happen; this one gives all the themes one last revisit so Lungbarrow can happen, and she explores them all through a great collection of well-realized characters. Much better.
Vampire Science Eight, Sam, Not-Grace The first OrmanBlum novel, this really wants to be the TV Movie done right. It's the only early EDA to get the Eighth Doctor right. Carolyn Not-Grace McConnell is actually a better character than Grace. The book works as a vampire story, with grey vampires and vampire hunters and interesting Holmesian doubles. The only problem is that it also gets Sam absolutely right—she's a female Adric who wishes she were Ace—and who wants that?
Walking to Babylon Benny If you hate the Benny solo books, this one won't change your mind, as it hits all the cliches (except the drunken-vacation ones). It has the People of the Worldsphere, clever hints that we're still in the Doctor Who universe without violating the rights, excerpts from Benny's memoirs, etc. But Kate does a great job writing Benny.
Seeing I Eight, Sam Again, the OrmanBlum gets the Eighth Doctor right when most of the other writers are doing him as Five or SevenFour. Again, they regrettably also get Sam right—and bring her back after a series of books where she was lost—but this time, she's grown up a bit, and is a lot less annoying. It also feels like a big sci-fi epic, something Kate on her own never pulled off.
Unnatural History Eight, Sam, Fitz Imagine someone taking one of those 1999 rec.arts.drwho threads trying to make sense of Mad Larry's ideas and turning it into a novel. Now imagine that the authors, jealous of everyone fawning over Paul Magrs, decided it should be a magical realist novel, even though they didn't really know what that meant. Now imagine that they were pissed off at all the other writers not getting the Eighth Doctor from the TV movie right. There's actually a good novel buried under all that, but it's pretty well buried.
The Year of Intelligent Tigers Eight, Fitz, Anji A long-overdue examination of the main characters, a great alien species, and an interesting conflict. A bit of Kate's "nice is good" ethic, and she's obviously way too obviously in love with the Eighth Doctor (man, I'd hate to be Jon), but otherwise a very good book.
Blue Box Six, Peri A late-90s techno-thriller that takes place in the early 80s—with realistic early 80s hacking and everything. Written in the Who Killed Kennedy style of a journalist trying to piece together the story retrospectively. And using that totally 80s Doctor, but with his companion who wasn't the 80s computer programmer one. And an intentionally one-note bad guy, who's obviously the mean girl who made fun of Kate in high school. It's like she tried as hard as possible to make this book difficult to pull off. But she mostly succeeded anyway.
Fallen Gods Eight The OrmanBlum attempt to write a completely un-OrmanBlum novel. The background characters are ciphers, the story is myth- rather than character-driven, and it doesn't even use Kate's fantasy version of the Eighth Doctor. An interesting experiment, but a book this short shouldn't get this boring.