Just want to say I tried taking seeds and it didn't work for me.
Bought about 400 seeds from some online seller of all types of ornamental tree and shrub seeds. Seeds came in little bags labeled Taxus baccata and they looked like taxus baccata seeds I've seen pictures of online. I stared at them for maybe two months before I decided it was time to try. I crushed the seeds in the bag until they were all little bits, because if you just eat the seeds straight they will pass through you without any effect. I then waited maybe another 3 days before I was going to try them. Over the course of three or four hours one night, I began eating small amounts of the seeds bits, chasing them down with water or chocolate. That night I took maybe 60 seeds worth of seed bits. I experienced practically no symptoms. There was a little grumbling in my stomach but I never even felt the urge to throw up. I took only 60 seeds worth that night just to see what it might feel like. I'm pretty sure I imagined a lot of symptoms out of paranoia because my hands were shaking like I was jittery, I thought I had a minor headache for a few minutes, and I thought I felt some tiny pain in my chest, but I'm almost certain I was just me creating those symptoms in my mind.
So I tried again the next day, and once again over the course of maybe 3 or 4 hours I ate bits of the seeds. I probably ate about 200 seeds worth of seed bits. It was the same story. All I felt was a little grumbling in my stomach but never enough to even feel sick. That news story about the guy in England who took 400 seeds and died said 400 was many times the lethal dose. I feel like 200 seeds, even if not the lethal dose, would at least have made me experience symptoms.
Regardless, I have some ideas why it might not have worked, but they are just wild speculation. First, perhaps the taxine poison in the seeds had become inactivated or dried out in the 3-4 days I left the seed bits sitting around. Second, there was some seed oil mush stuck to the plastic bag I mashed the seeds up in that I didn't eat or lick, so perhaps the poison leaked out into the plastic and I was just eating harmless seed bits at that point. Third, I had some food in my stomach both nights, but not that much, but still it might have been enough to soak up the taxine and only release it slowly so that it didn't have enough effect, similar to how eating bread and pizza when you are drinking alcohol slows the absorption and you won't get dangerously drunk. Fourth, because I was taking small amounts of seed bits over the course of 3-4 hours, perhaps the concentration of taxine was never high enough to do anything - you might need to take the seeds all at once in order for it to work. Fifth, I had some tea that night, so perhaps the caffeine that keeps people awake and alert and their heart pumping a little faster than usual counteracted the taxine which affects the heart as well. But again, this is only wild speculation. There are an infinite number of reasons why it might not have worked. My best guess is reason 1 or reason 4. They say yew poisoning is rare, so perhaps this experience has something to do with that.
Hope this account helps other people.