I watch his Holt's videos. Usually after the auction. But I skip through most of the video just watching the firearms that I'm interested in. SXS mostly. Simon seems to know his stuff. If you think about it there's just too many maker's, models and other stuff to know everything about British gunmaking and to be knowledgeable enough to not use other's work to pass on some knowledge. JMO but I think he used to cover more SXS's than O/U's, his latest videos seem to be going the other way now. And of the O/Us that he's covering by far the most aren't even British made. But, as other's have mentioned he's really trying to sell firearms for Holt's not delve deeply into the history of British firearm maker's unfortunately.