I could drink 10 cups of tea, and only feel the urge to wee. That much coffee and I'd be up the wall!
This just looks like evidence that you don't drink tea and don't know what's in it, or that you've confused herbal tea with tea from the tea plant. Tea seems to have about half the amount of caffeine coffee does. For example, here are figures from the Mayo Clinic:
Coffee is more of a stimulant than tea, but tea is still very strong, so it's unsurprising that the British were aware of its effects. If you're trying to stay awake, tea will do the job.
Comments
This just looks like evidence that you don't drink tea and don't know what's in it, or that you've confused herbal tea with tea from the tea plant. Tea seems to have about half the amount of caffeine coffee does. For example, here are figures from the Mayo Clinic:
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h...
Coffee is more of a stimulant than tea, but tea is still very strong, so it's unsurprising that the British were aware of its effects. If you're trying to stay awake, tea will do the job.