Has anyone noticed how Lucy Worsley often picks the wrong words? Her English lets her down. She once said that the while the English had the expression "the French disease", the French thought that the English were mainly afflicted with "flagellation". She obviously meant "flatulence" - the people with her looked a bit baffled for a second.
I've noticed a couple of others, they were sort of George-Bushisms but I can't remember them exactly at the moment. She may know her subject well, but if she uses the wrong words to put it across, at worst, she will be misinforming people, and, at best, she will be undermining her own authority by not expressing herself properly.
I've also noticed other young people in the media who obviously know their onions, but then use the wrong words to put across what they are saying. E.g. by confusing "reticent" and "reluctant". Once I've heard someone get something like that mixed up, I then start pondering on it and don't listen to the rest of what they have to say.