TIME LORD: Ah. Welcome, Doctor. DOCTOR: What's going on? Don't you realize how dangerous it is to intercept a transmat beam? TIME LORD: Oh, come, Doctor, not with our techniques. We Time Lords transcended such simple mechanical devices when the universe was less than half its present size.
1983, The Long Way Home, (video game published with 16/48 Magazine):
You are in a TRANS-MAT unit. You see a faulty control panel with a button on it.
2005, Andrew Cartmel, Through Time: An Unauthorised And Unofficial History of Doctor Who, page 166:
"Dangerous things, transmats," says the Doctor happily. Then a Dalek sentry turns up and pursues him up the cellar stairs.
The traitorous Utrom scientists I have captured are completing a colossal transmat device. With it, I will send forth my armies and enslave the stars, one world after another. There is no hope. There is only the Shredder.
I have justified the worst behavior for the best of causes. But I was right. The threat was real. But maybe I backed the wrong child to stop it. The transmat portal you created? That was brilliant, Lena.
It wasn't far enough away to think about transmatting and besides, that was no longer a viable option, what with vandals having wrecked some of the booths in the area.